A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Can you write down eight eights so that they add up to one thousand?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

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 ()