We bought a total of 80 books at the store. Math books cost $4 and history books cost $5. The total price was $368. How many math books did we buy?  Choose one:  A) 28  B) 32  C) 36  D) 40  E) 44

Rationale: m + h = 80 h = 80 - m 4 m + 5 h = 368 4 m + 5 * ( 80 - m ) = 368 m = 32 the answer is b .
Answer: B