<PRE><B>Question 210377</B>

Let amount of CD-Rom drives sold be C
Then since they sold 6 times as many hard drives as CD-Rom drives then they sold of 6C hard drives
Also, since they sold half as many floppy drives as they did hard drives, then they sold {{{1/2}}} of 6C, or 3C floppy drives

Since they sold 300 drives, then: C + 6C + 3C = 300
10C = 300
C = 30


This means that {{{highlight_green(30)}}} CD-Rom drives were sold.

As a result, they sold {{{highlight_green(180)}}}  (6 * 30) hard drives, and {{{highlight_green(90)}}}  (3 * 30) floppy drives. 
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