Which tank will fill first?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Find the smallest sentence with all the English alphabet.

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

What is the largest number you can write with just 3 digits?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What do you answer even though it never asks you questions?