Question

Write as a mathematical expression and solve. The sum of a number and 2 times the number is 21. Find the number.

Answer 1

x + 2x = 21

Or

3x = 21

Explanation:

Let the required number be x.

Two times of the number = 2x

Above statement in Mathematical form can be expressed as:

`x + 2x = 21 \\ \implies \: 3x = 21`