SOLUTION: Question: An office supply store recently sold a black printer ink cartridge for 17.99 and a color printer ink cartridge for 25.99. At the start of a recent fall semester, a total

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Question 1098694: Question: An office supply store recently sold a black printer ink cartridge for 17.99 and a color printer ink cartridge for 25.99. At the start of a recent fall semester, a total of 55 of these cartridges was sold for a total of $1157.45. How many of each type were purchased?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.B%2BC=55 - Total number of cartridges
2.1799B%2B2599C=115745 - Total cost of cartridges
Multiply eq. 1 by 1799 and subtract from eq. 2,
1799B%2B2599C-1799B-1799C=115745-98945
800C=16800
Solve for C then use either equation to solve for B.