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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