In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

You need to arrange three 7 and mathematical symbols to form number 1?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

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 ?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

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

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?