Last month a store sold 4 times as many tapes as CDs. If the total quantity of these two items sold was 360, how many tapes did the store sell?
A) 288
B) 360
C) 90
D) 20

Question

Quizplus · Accepted Answer

The store sold 288 tapes. If T represents the number of tapes and C the number of CDs, then T = 4C. Given T + C = 360, substituting 4C for T gives 4C + C = 360, so 5C = 360. Solving for C gives C = 72, and thus T = 4C = 288.

Last Month a Store Sold 4 Times as Many Tapes