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bought 20 first stamps and 10 post card stamps for $17.10. she spent $70.00 on 80 1st class stamps and 50 post card stamps. Find cost of each stamps.

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1 Answer

Set up and solve a system of equations.
Let x represent the cost of 1st class stamps
Let y represent the cost of post card stamps
17.10 = 20x + 10y  ....  (1)
70.00 = 80x + 50y  ....  (2)
 
subtracting 4 of equation 1 from equation 2 you obtain the following:
 
1.6 = 10y
which gives y = .16
Therefore post card stamps cost $0.16
Plugging this back into either equation you get x = .775
Therefore the cost of 1st class stamps is $0.775