Problema Solution
Sydney's parents pay her according to her grades. For each "A" that she earns, they add $12 and for each "C" they subtract $5 dollars. On a recent grade period, she got only "A's" and "C's" for her 6 classes. If she got a total of $21, how many of each grade did she get?
Answer provided by our tutors
3 A's and 3 C's.
Total 3*12 - 3*5 = 36 - 15 = 21.
So, 3 A's and 3 C's is the answer.