I am an odd number. Take away a letter and I become even. What number am I?

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?

Can you find out the remainder when 3^300 is divided by 5?

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

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

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

What's a single-digit number with no value?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.