SOLUTION: The value of 92 stamps is $14. There are 10 cent stamps and 25 cent stamps. Find the number of 10 cent stamps.
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Question 910014: The value of 92 stamps is $14. There are 10 cent stamps and 25 cent stamps. Find the number of 10 cent stamps.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
a+c=92,
0.1*a+0.25*c=14
a=92-c
0.1*(92-c)+0.25*c=14
9.2-0.1c+0.25*c=14
0.15*c=4.8
c=32.0
a=92-c
a=60.0 at $0.10 and c=32.0 at $0.25
check
60.0+32.0=92
0.1*a+0.25*c=14
0.1*60.0+0.25*32.0=14
6.0+8.0=14
14.0=14
ok
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