SOLUTION: Sarah and Keith Robinson purchased 40 stamps, a mixture of 39 cent and 24 cent stamps. Find the number of each type of stamp if they spent $14.85

Question 518241: Sarah and Keith Robinson purchased 40 stamps, a mixture of 39 cent and 24 cent stamps. Find the number of each type of stamp if they spent $14.85
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = number of 39c stamps
Let = number of 24c stamps
given:
(1)
(2) ( in cents )
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
They buy 35 39c stamps
They buy 5 24c stamps
check:
(2)
(2)
(2)
OK
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