JeopardyLabs

Algebra Avengers

100

I'm a number. If you double me and add 8, you get 20. What am I?

I am 6. 

300

I'm a secret number. If you multiply me by myself and then subtract 5, you get 11. What am I?

I am  4 or -4.   x²-5=11, so x= 4 or x= -4

Logic

200

Bob adds three numbers. Afterward, he multiplies the same numbers and gets the same result. What are these numbers?

1, 2, 3.

Shapes Shifters

100

Bees love geometry. What’s their favorite figure?

It’s a hexagon.

200

A triangle has angles in ration of 2:3:4. What are the measures of its angles?

 40, 60, 80.

Number Ninjas

100

Find  6 + 6 x 6 – 6 + 6 =?

42

200

When David was eight, his little brother Alex was half his age. David is 30 now. How old is Alex?

Alex is 26

300

I’m an odd number. But if you take away a letter from my name, I will become even. What number am I?

Seven

Math Mysteries

200

If a box contains 15 red balls and 10 green balls, what is the ratio of red balls to the total number of balls in the box?

3:5 (15 red balls out of 25 total balls). 

400

A man leaves his house at 6:45 AM. and walks to a train station at 4km/hr. He arrives exactly when the train supposed to leave at 7:00 AM. How far is the station?

 1km