Posted by Evy on Friday, November 1, 2013 at 10:56pm.
The cost of an order of 10 computer disks and 3 packages of paper was $27. The next order was for 30 disks and 5 packages, and the cost was $65. Find the cost of a single disk and a single package of paper.

Math  Steve, Friday, November 1, 2013 at 11:10pm
10d + 3p = 27
30d + 5p = 65
from the first, we see
30d + 9p = 81
so, subtracting, we see that
4p = 16
p=4
so, d=2.50

Math  Evy, Saturday, November 2, 2013 at 12:55pm
the professor answer for the disk is $1.50 who's right?

Math  Steve, Saturday, November 2, 2013 at 3:43pm
well, I see I was wrong. Could you not check my answer?
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