Question

The sum of three times a number and 10 is 31.Find the number.

Answer 1

7

Explanation:

Let the number be n.

`3n+10=31`

Subtract 10 from both sides:

`3n+10-10=31-10`

`3n=21`

Divide both sides by 3:

`(3n)/(3)=(21)/(3)`

`n=7`