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OpenStudy (anonymous):
A man bought 42 stamps, some 13¢ and some 18¢. How many of each kind did he buy if the cost was $6.66?
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OpenStudy (anonymous):
Let 13¢ stamp = x, 18¢ stamp = y x + y = 42 0.13x + 0.18y = 6.66 x = 42 - y 0.13(42 - y) + 0.18y = 6.66 Solve for y, then for x.
OpenStudy (anonymous):
x=18 y=21
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