SOLUTION: Please help with this problem. I have tried to look at other similar problems to help guide me, but is not working. --> A stamp collection consists of 3, 8, and 15 cent stamps. T

Question 161980: Please help with this problem. I have tried to look at other similar problems to help guide me, but is not working.
--> A stamp collection consists of 3, 8, and 15 cent stamps. The number of 8 cent stamps is one less than triple the number of 3 cent stamps. The number of 15 cent stamps is six less than the number of 8 cent stamps. The total value of all the stamps is $2.47. Find the number of 8 cent stamps in the collection. [Fifteen points for the correct algebra equation and five points for solving the equation.
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Let t be the three cents stamps, e be the 8 cents ones and f be the fifteens
Given
so
which says
so

Now using the values for f and e in terms of t above, substitute and solve

Now use this value for t to find f and e

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