Question 20182
Hello There:

If you think the number of tapes sold is 360, then you didn't understand the total problem.  Both the number of tapes and CDs equals 360.  The problem tells us that.  So, if you choose 360 for the number of tapes, then that doesn't leave anything left over for the number of CDs.

Let x = the number of CDs sold

Then 4*x = the number of tapes sold

The given information tells us that:

x + 4*x = 360

5*x = 360

x = 360/5

x = 72

There were 72 CDs sold, so 4*72 is the number of tapes sold.

4*72 = 288

The correct answer is "a".

~ Mark