Question

Twice a number is added to the number, giving 90 find the number

Answer 1

Let the number be called x. Twice the number would be 2x, and adding twice the number to the number can be expressed mathematically as;

2x + x

If the addition gives 90, then,

2x + x = 90

3x = 90

Divide both sides of the equation by 3 and you now have;

3x/3 = 90/3

x = 30