Question

Three times the sum of 5 and a number is a value between 12 and 21.

Answer 1

Answer:

A.

Step-by-step explanation:

We are told that three that the sum of 5 and a number is between 12 and 21 which means:

$12$

Divide all sides by 3:

$\frac{12}{3}$

$4$

$4$

Subtract 5 on both sides:

$4-5$

Simplify:

$-1$

So the answer is A.

Slightly different route:

$12$

Distribute 3 to the terms in the ( ) next to it:

$12$

Subtract all sides by 15:

$12-15$

Simplify:

$-3$

Divide both sides by 3:

$\frac{-3}{3}$

Simplify:

$-1$