John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

What number should come in place of the question mark below?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

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?

I am an odd number. Take away a letter and I become even. What number am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

When can we add 2 to 11 and get 1 as the correct answer?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Replace the question mark in the picture below.

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?