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

Explain how?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

Can you count the number of triangles in the given figure?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

There is something which you can be arrested for attempting but not for successfully completing.

Find out the missing number in the picture attached:

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!