11. If you count 20 houses on your right going to school, and 20 houses on your left coming back home, how many houses in all have you counted?
12. What do the numbers 11, 69 and 88 have in common?
13. Two mothers and two daughters go to a pet store and buy 3 cats. Each female gets her own cat. How is that possible?
14. Find 4 consecutive numbers that add up to 130.
15. Which number should be put in the empty space to maintain the logical sequence?
160; 339; 518
89; ____ ; 457
16. Find 4 consecutive numbers that add up to 50.
17. A carpenter was in a terrible hurry. He had to work as quickly as possible to cut a very heavy 10 metre plank into 10 equal sections. If it takes 1 minute per cut, how long will it take him to get the 10 equal pieces?
18. What time is it when 10 cats chase 1 mouse?
19. If there are 3 cups of tea and you take one away, how many do you have?
20. If your sock drawer has 8 white socks, 6 black socks, 4 brown socks and 2 green socks, how many socks would you have to pull out to be sure you had a matching pair?
Answers
11. 20 - you counted the same houses going and coming!
12. They can still be read the same when read upside down.
13. There is a grandmother, a mother and a daughter. The mother of the daughter is also the daughter of the daughter's grandmother, so there are 2 daughter and 2 mothers, but only a total of 3 people.
14. Consecutive numbers: 31, 32, 33, 34
15. 273 - the two outer numbers are added together, then divided by 2
16. Consecutive numbers: 11, 12, 13, 14
17. Nine minutes, it only takes 9 cuts to get 10 equal sections.
18. 10 after 1
19. You have only one cup - the one you took away.
20. Five socks - there are only 4 colours, so five socks guarantees that two will be of the same colour.
