We bought a total of 80 books at the store. Math books cost $4 and history books cost $5. The total price was $373. How many math books did we buy?
Select:
A) 23 B) 27 C) 31 D) 35 E) 39
M + H = 80   H = 80 - M   4M + 5H = 373   4M + 5*(80 - M) = 373   M = 27   The answer is 27.
<result>B</result>
We bought a total of 80 books at the store. Math books cost $4 and history books cost $5. The total price was $373. How many math books did we buy?