SOLUTION: a postal clerk sold 75 stamps for $4.80. some were 5-cent and some were 8-cent stamps. how many of each kind did he sell?
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Question 23910: a postal clerk sold 75 stamps for $4.80. some were 5-cent and some were 8-cent stamps. how many of each kind did he sell?
Answer by Paul(988) (Show Source): You can put this solution on YOUR website!
Let x represent the 8-cent stamp
Let y represent the 5-cent stamp
x+y=75
y=75-x
8x+5y=480
8x+5(75-x)=480
8x+375-5x=480
3x = 105
x = 35
y=75-35
y=40
Hence, he sold 40 5-cent stamp and 35 8-cent stamp.
Paul.
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