1. A frog fell into a well 12 metres deep, he could jump 3 metres, but every time he jumped 3 metres, he fell back 2 metres. How many times did he have to jump to get out of the well?
2. If 5 cats catch 5 mice in 5 minutes, how long will it take for 1 cat to catch a mouse?
3. It took a driver 1 hour 30 minutes to go Cape Town from Johannesburg with the latest sport car, and it took him 90 minutes to come back from Cape Town to Johannesburg using the same car, the same route and the same speed. What could have happened?
4. Can you find 4 consecutive numbers that add up to 170?
5. Which number should be put in the empty space to maintain the logical sequence?
312; 1140; 68
58; _____ ; 112
6. How much soil is in a hole 1 metre deep and 1 metre wide?
7. Can you find 4 consecutive numbers that add up to 34?
8. Which number should be put in the empty space to maintain the logical sequence?
182; 52; 78
21; ____ ; 114
9. How many times can you subtract the number 5 from 25?
10. What three consecutive numbers have the same answer when added together and when multiplied together?
Answers
1. Ten times. On the tenth jump he reached 13 feet and was out!
2. Five minutes
3. Nothing happened, 1 hour 30 minutes and 90 minutes are the same!
4. 41, 42, 43, 44
5. 495 - the two outer numbers are added together, then multiplied by 3.
6. There is no soil in a hole, only air.
7. 7, 8, 9, 10
8. 182 - the two outer numbers are added together, then divided by 5.
9. Only once, after that you will be subtracting 5 from 20, then 5 from 15, etc and not necessary from 25.
10. 1, 2, 3
