Question

Joe's mother sent him a total of 132 cookies.

She sent 18 fewer oatmeal cookies than
peanut butter cookies. How many oatmeal
cookies did she send to Joe?
(A) 75
(B) 62
(C) 55
(D) 57

Answer 1

57 oatmeal cookies

Explanation:

x - peanut butter cookies

y - oatmeal cookies

y = x - 18 ⇒ x = y + 18

( y + 18 ) + y = 132

2y = 132 - 18

y = 57 oatmeal cookies

Answer 2

D because you can set cookies as a variable x