10+10 and 11+11 can give you the same answer.

Explain how?

Count the squares in the matchstick puzzle below?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What English word has three consecutive double letters?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

What Time Should the last watch show in the below figure?

What work can one never finish?