SOLUTION: a collection of stamps consists of 3 cent stamps, 7 cent stamps, and 12 cent stamps. the number of 3 cent stamps is five less than the number of 7 cent stamps. the number of 12 cen

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Question 1038578: a collection of stamps consists of 3 cent stamps, 7 cent stamps, and 12 cent stamps. the number of 3 cent stamps is five less than the number of 7 cent stamps. the number of 12 cent stamps is one half of the number of 7 cent stamps. the total value of all the stamps is $2.73. find the number of each type of stamp
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let n=7 cent stamps. Then 3-cent equals n-5, and 12-cent equals n/2. So.
7n+3(n-5)+12(n/2)=273
7n+3n-15+6n=273
16n=288
n=18 7-cent stamps, 13 3-cent stamps, 9 12-cent stamps!!!!!!!!!!!!!!!!