SOLUTION: A stamp collection consists of 5,13, and 18 cent stamps. The number of 13 cent stamps is one less than twice the number of 5 cent stamps. The number of 18 cent stamps is five mor

Question 102985: A stamp collection consists of 5,13, and 18 cent stamps. The number of 13 cent stamps is one less than twice the number of 5 cent stamps. The number of 18 cent stamps is five more than the number of 13 cent stamps. The total value of all the stamps is $2.60. Find the number of 13 cent stamps in the collection.
This is how far I have made it.
5=x
13=2x-1
18=2x-1+5
x+2x-1+5=$2.60
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
You're on the right track. Here's a hint.
Number of 5 cent stamps = x
Number of 13 cent stamps = 2x-1
Number of 18 cent stamps = 2x-1+5
Value of 5 cent stamps = 0.05*x
Value of 13 cent stamps = ?
Value of 18 cent stamps = ?
Get a value equation for each stamp category.
Then plug those into an equation for the total value of the collection.
Total value of all of the stamps = $2.60

Solve for x. Then you know the number of stamps in each category.
Keep going and if you get stuck post another question.
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