If w = 7a + 4b, which of the following equations is solved for a?

Question

A) a=w-7b/4

B) a=w/7 -4b

C) a=w-4b/7

or

D) a=w/7 -28b

Answer 1

7a = w-4b

a = w/7 - 4b/7

none are correct

If you had to choose one though, A is doubly wrong. B and D get at least the w/7 part correct

only C had the b term correct. B has the w term right and almost the b term correct

On those tests that say choose the "best" answer, B might be the "best" but it's wrong too.

But turns out they probably want C. It's "correct" if you put in some missing parentheses

a=(w-4b)/7. Without the parentheses it really reads w - (4b/7) which is incorrect.