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?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Replace the question mark with the correct number in below Picture:

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

Can you count the number of blocks in the picture below?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What can jump higher than a building?

what does the below rebus means?