Can you find out which number multiplied by itself will give the output as 12345678987654321?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

If 21x = 79x, what is the value of x?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

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

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?

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 ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?