The villainous Dr. Schrödinger

has developed a growth ray and intends to create

an army of giant cats to terrorize the city. Your team of secret agents has tracked him

to his underground lab. You burst in to find… that it’s a trap! Dr. Schrödinger has slipped

into the next room to activate his device and disabled the control

panel on the way out. Fortunately, your teammates are

masters of spy-craft. Agent Delta has hacked

into the control panel and managed to reactivate

some of its functionality. Meanwhile, Agent Epsilon has

searched through surveillance to find the code for the door: 2, 10, 14. All you have to do is enter those numbers

and you’ll be free. But there’s a problem. The control panel has only three buttons: one which adds 5 to the display number, one which adds 7, and one which takes the square root. You need to make the display output

the numbers 2, 10, and 14,

in that order. It’s okay if it outputs different

numbers in between, but there’s no way to reset the display, so once you get to 2, you’ll have to continue

on to 10 and 14 from there. Not only that, Agent Delta explains that there are other traps

built into the panel. If it ever shows the same number

more than once, a number greater than 60, or a non-whole number, the room will explode. Right now, the display reads zero,

and time is running out. There’s only one way to solve the puzzle,

with a few small variations. How will you input the code to escape

from Dr. Schrödinger’s lair and save the day? Pause the video now if you want

to figure it out for yourself! Answer in: 3 2 1. You look over your options. Adding 5 or 7 increases the number, and the square root button

will make it smaller. But there are only a few options

where you can use that button: 4 9 16 25, 36, and 49. You’d love to make 4 or 16. Then you could hit the square root button

once or twice to get 2. But you can’t make either with

just the 5 and 7 buttons. What will you do? You look at the other possible options for

numbers you could take the square root of. Nine you can’t reach. Twenty-five and 49 would take you back to

5 or 7, and you can already get to each

of those. Thirty-six is your only option. You add 5, 7, 5, 7, 5, 7, and then hit the square root button. Why that series of 5s and 7s? It’s somewhat arbitrary, but you know that you want

to avoid 10, 14, and perfect squares, since you’ll need them later. This gets you to 6. Does that help? Looking at your options,

you see that 16 is now in your sights. You add 5 twice more to reach it. Then hit square root twice. That gets you to 2. You’re on your way! Now to 10. You can’t get straight

there through addition alone, so you’re going to have

to reach another square. Taking the square root of 9 or 25 would

get you to a good place, but it turns out that 25

is unreachable from 2. So you add 7 to get to 9, then take the square root again. That gets you to 3. Adding 7 again makes 10. Finally, you need to reach 14. Thinking backwards, you imagine where

you could be before 14: 7 or 9. But 9 won’t work because

you’ve already used 9. However, you could get to 7

by reaching 49 first. You add your way towards it, being careful not to hit any

of the numbers you’ve hit so far. You thread your way carefully, adding five 5s and two 7s. Then, square root to 7, and add 7 more. The door opens,

and you’re out of the trap. Thanks to your problem-solving skills, your team gets Schrödinger’s cats out

of the box in the nick of time. As for Schrödinger,

you can be certain of one thing: he’ll be spending quite some

time in a box of his own.

Sign up to be emailed the solution to the bonus riddle: https://brilliant.org/tededm2s3/! Also, if you sign up for a PREMIUM membership using one of our links, you will get 20% off the annual fee. Riddle on, riddlers!

Finally a riddle that I could solve!

Don’t wprry if you can solve the riddle in time…only the box will be enlarged, not the cats!

1:55 0:00

Narrator: but there’s a problem

Me: OF COURSE THERE IS A PROBLEM!!!

11 – 8 – 5 – 10 – 7 – 14 – 28 – 25

Start from 25 and make a tree for every step this will be shortest branch 😊

Easy one

For the end riddle; 11-22-19-16-13-10-7-14-28-25

I know the fewest (in the comments) is 7 but this is another way to solve it

11-3×2-3-3-3x2x2-3=25 8 moves

Wait,zero is a non-whole number,so wouldn't the room explode right away?

he wants to make giant catsMe to bro

Can I solve the giant cat army riddle?

Ah. Well. No.

I think the answer to the bonus riddle is eight. The solution is 11-3=8

8×2=16

16-3=13

10-3=7

7×2=14

14×2=28

28-3=25

Just find the least number of moves by making a table by doing both operations on the row before it.

11

*2 = 24, -3 = 8

24, 8

48, 21, 16, 5

96, 45, 42, 18, 32, 13, 10, 2

192, 93, 90, 42, 84, 39, 36, 15, 64, 29, 26, 10, 20, 7, 4, -1

Notice that in this row of sixteen numbers(I counted them) we have a 7. If you multiply 7 by 2 twice you get 28. Then subtract 3 to get 25.

So, the path is

11-3=8

8-3=5

5*2=10

10-3=7

7*2=14

14*2=28

28-3=25

In 7 steps, and 8 numbers: 11,8,5,10,7,14,28,25.

The next best solution is

11-3=8

8×2=16

16-3=13

13-3=10

10-3=7

7×2=14

14×2=28

28-3=25

I just realized its spelled the same as

Erwin Shrõdinger

Im redoing all the riddles cuz im bored

5-10-17-24-31-36-6-11-16-4-2-7-14. ted ed , ur answer sucks, my answer is only 13steps while yours is 23steps

11-25: 11-8-5-25 }3 STEPS ONLY

Dunno if this is the best, but my answer to the post challenge is… 11, 9, 7, 4, 8, 5, 10, 20, 17, 34, 31, 28, 25

Can’t believe i answered it mentally. This is the second riddle i got so far.

Literally no one:

TedEd:

"……bUt tHeRes a pRoBleM"11×2=22-3=19-3=16-3=13-3=10-3=7×2=14×2=28-3=25!!!

I know it's not the shortest but I bought it was right before I read the comments

Solved the bonus riddle in 8 moves reply if you can do better.

Yeh boi

That is a… uh…. very interesting security mechanism you've got there, Dr. Schrodinger….

I CANT BELIEVE I FINALLY SOLVED A TED ED RIDDLE

11-3=8

8-3=5

5×2=10

10-3=7

7×2=14

14×2=28

28+3=25

Seven is the fewest possible number of moves

But idk tho could be wrong

i would press Square root and commit suicide

omg, i solved it

BONUS: 11-3 => 8-3 => 5×2 => 10-3 => 7×2 =>14×2 => 28-3 => 25

so if i am right, 7 moves are needed

Me at school: Watches Ted Ed education videos

Me at home: Watches Tad Ed riddles

MATRIXthis is for the bonus riddle

11-3-3=5x2x2=20-3=17×2=34-3-3-3=25

I just looked at how they solved it at the intro and that was my answer lol

First one I actually solved!!! This is such a fun series

Another possible solution: 5 12 19 24 29 36 6 11 16 4 2 9 3 10 15 20 27 34 39 44 49 7 14

5 12 19 24 31 36 6 11 16 4 2 9 3 10 15 20 25 32 39 44 49 7 14 also work

you get in the room, and you don't

Solved in 4 minutes and 22 seconds. Safe to say Dr. Schrödinger is dead… and alive..? 😳

I got this one but I didn't do as much thinking, I was smart and also lucky to get it on the first try 😂

i found the first solution and for the other riddle the solution is:

11(-3) 8(-3) 5(*2) 10(-3) 7 (*2) 14(*2) 28(-3) "25"

At least that what i could find :<

Bonus riddle:

11,8,5,10,7,14,28,25

At least it’s cats

If anything it’s a little good

My answer is 0-5-12-19-24-31-36-6-11-16-4-

2-9-3-10-15-20-25-30-35-42-49-7-

14.

I basically did all of this myself and got proud since this is my first time solving a Ted-Ed puzzle.🎉😙

…

I don't even know how to do square roots

Giant litter box cage

0:08 the shape is very odd

Very

ODD4:36 11-3-3×2-3x2x2-3=25

Thank you for the video! All of you friends are super awesome!

B-but I love cat ;~;

Every citizen shall own a pickle…

Gg.. Problem solved

Man invents growth ray, uses it to make giant cats

the answer was obous sence the ray is top side hit it with a airstike

blow it up

or cut the power

Why did you have to break into his base? The cats were on the outside so you could’ve just snuck around the outside and stolen the box of cats 🤷♂️

I found another solution which takes the same number of steps:

5 12 19 26 31 36 6 11 16 4 2 9 3 10 17 24 29 34 39 44 49 7 14

anyone reminded of the lego ninjago movie?

I ACTUAPLY DID IT ON MY OWN

Idk how to get the square root …so I'm gonna die early 👍

For bonus riddle

1)11-3=8 2)8-3=5 3)5*2=10 4)10-3=7 5)7*2=14 6)14*2=28 7)28-3=25. That's it. 7 steps

Is anyone with me when I say! What?

My answer. 5-12-19-24-31-36-6-11-16-4-2-9-3-10-17-22-29-34-39-44-49-7-14

11 – 3 = 8 – 3 = 5 x 2 = 10 – 3 = 7 x 2 = 14 x 2 = 28 – 3

If Agent Delta is so great, how come he only hacked some of its functionality and not all?

This riddle has nothing to do with cats, instead I was tricked into a math problem. I’m calling shenanigans

4:41

11-3-3×2-3-3×2-3=25

Who is watching this and do not even solve the riddle? I am like if you do too

Well if ephsilon looks through the camera for the 2 numbers to get, why didn't he get the code?

1:16 Anyone else noticed whats wrong with first line?

Literally the only ted Ed riddle I actually solved!!!!!!

11 -3

8 -3

5 *2

10 -3

7 *2

14 *2

28 +3

25

Step 1: Make a mistake on purpose

Step 2: Escape quickly and wait for the room to blow up and blow down the door

Did i do it?

I did it! My first ted ed riddle i have solved

Solution in 20 steps:

5

1015 20 25 30 35 42 49 71421 26 31 36 6 11 16 42Answer: "Cucumber"

laser cut the door, easy.

did anyone notice that part of the answer literally showed up at 1:21

(the first eight numbers)

Gets stuckescapesand steals a box "I sAvEd tHe dAy"This is completely unrealistic

8 is the answer of the bonus riddle.

Why are we together with these two master agents

I would of called johnny, dukey, Mary and Susan test, they deal with Mr Mittens lol

Won’t the explosion explode dr enthanew?

I’ll get the laser ready.

I’m such a nerd because I was able to do this with no hints

5 12 19 24 29 36 6 11 16 4 2 9 3 10 15 20 25 32 39 44 49 7 14

2x2x2x2=16-3-3=10×2= 20-3-3-3=11×2=22×2=44-3-3-3-3-3-3=26×2=52-3-3-3-3-3-3-3-3-3=25 and i know there be someone will say they didt say put it in the comments

Omg yay I was able to solve this one without help!

can start with a square root since sq root of zero is 1. i got 0 1 6 11 16 4 (2) 9 3 (10) 15 20 25 30 35 42 49 7 (14). think this is faster than the solution

MATH!!! MY WEAKNESSES!!!

-3,-3,×2,×2,×2,-3,-3,-3,-3,-3…It's 11 to 25… I got 10 moves

HMm, maybe This was Deltas ( from the voice ) first job. After this mission. She probably went through baby birth and remembered pubetry and had to change jobs to go to the voice.

And now we wait… For her to forget puberty and baby birth and come back. ;-;

11

8

5

10

20

17

14

28

25

(8 moves)

because im a genius, im going to fix the keypad, end game aha

ALL THESE RIDDLES ARE MAAAAATH

1:21 there are a total of 5 pairs of repeation

simple:11 times 2 is 22 -3=19-3=16-3=13- 3=10 -3=7 times 2=14×2=28-3=25

they could've lockpicked the door to get out

hopefully it's not a master lock

5, 12, 19, 26, 31, 36, 6, 11, 16, 4, 2, 9, 3, 10, 15, 20, 25, 32, 39, 44, 49, 7, 14. The combination is NOT unique as addition is commutative, so you change what numbers you add first in an extended sequence… i.e., adding a five before a seven, etc.

Me reading the comments before the video loads:

o.o

i managed it a slightly different way.

+5, +7, +7, +7, +5, +5, Sqrt, +5, +5, Sqrt, Sqrt, +7, Sqrt, +7, +7, +7, +5, +5, +5, +5, +5, Sqrt, +7

5, 12, 19, 26, 31, 36, 6, 11, 16, 4, 2, 9, 3, 10, 17, 24, 29, 34, 39, 44, 49, 7, 14.

still works though i think its like 2 buttons longer. no copies, and it doesnt go over 60.

Nah

2,10,14

done