Exercises for Your Mind !

First name / Nickname:

I have a cylinder with a diameter of 3cm/π and a 21 cm straw - how many times can I wrap the straw around the cylinder ? 21 14 7 3

In 21 years I will be 5 times as old as I was 3 years ago, how old will I be 1 year from today ? 12 11 10 9

Find the next number in the series 1, 8, 9, 64, 25, ... ? 251 192 216 267

There are 3 numbered non unique balls in a bag with an average value of 15. If I pick out a 17 and 13 what is the value of the third ball 17 15 13 11

A car is travelling at a constant velocity of 10 meters/s and a second car starts moving 5 seconds after car 1 at 12 meters/s. After 10 seconds how far is car 2 from car 1 ? (assume when car 2 starts speed is instantaneously at 12 meters/s) 60 m 50 m 40 m 30 m

A 5cm cylinder is rolling covering travelling at 10cm/s - how far will it have travelled in 14 seconds ? 70 140 210 280