Q: A man bought 42 stamps, some 13¢ and some 18¢. How many of each kind did he buy if the cost was $6.66?

A: Let the amount of 13? stamps purchased be x
Let the amount of 18? stamps purchased be y
x+y=42................................?
0.13x+0.18y=6.66.....................(?
Rewrite (1),
x=42-y................................?
Substitute x in [ [ (2),
0.13(42-y)+0.18y=6.66
5.46-0.13y+0.18y=6.66
0.05y=1.2
y=24
x=18
Therefore, the man bought 18 13? stamps and 24 18? stamps. ] ]

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Asked 6/18/2013 9:30:00 AM

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