Question

Which of the following expressions is not equivalent to $36a$?

• A. $(4a-2a)18$
• B. $3\left(6a\right)\times 2$
• C. $(20+16)\times a$
• D. $(12+a)\times 3$

Answer 1

The correct option is D $(12+a)\times 3$

On solving option a, we get:

$3\left(6a\right)\times 2=3\times 6\times 2\times a$
$=36a$

On solving option b, we get:
$(12+a)\times 3=12\times 3+a\times 3$
$=36+3a$, which is not equivalent to $36a.$

On solving option c, we get:
$(20+16)\times a=36a$
On solving option d, we get:
$(4a-2a)\times 18=2a\times 18=36a$

Therefore, option b: $(12+a)\times 3$ is not equivalent to $36a.$