Christi's mother gives her $9.00 to buy $0.10 and $0.15 stamps. Christi returned with $1.75 in change and a total of 60 stamps. how many of each kind of stamp did she buy ?

Question

27-03-2018
Mathematics

contestada

Christi's mother gives her $9.00 to buy $0.10 and $0.15 stamps. Christi returned with $1.75 in change and a total of 60 stamps. how many of each kind of stamp did she buy ?

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Аноним Аноним · Answer 1 · 2018-03-27T06:04:22+02:00

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Information Given
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Total Cost of the stamps = $9.00 - $1.75 = $7.25
Total number of stamps = 60
Value of the $0.10 stamp = $0.10
Value of the $0.15 stamp = $0.15

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Assumed all $0.10 stamps.
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Assumed all the 60 stamps she bought were $0.10 stamps.
$0.10 x 60 = $6.00

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Find amount not accounted for.
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Amount of money not accounted for:
$7.25 - $6.00 = $1.25

The $1.25 must had been used to pay for the $0.15 stamps.

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Find difference in values between the two stamps.
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Difference in the value of the two stamps:
$0.15 - $0.10 = $0.05

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Find number of $0.15 stamps
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Number of $0.15 stamps = $1.25 ÷ $0.05 = 25
There were 25 $0.15 stamps.

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Find number of $0.10 stamps.
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Number of $0.10 stamps = 60 - 25 = 35
There were 35 $0.10 stamps.

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Answer: 35 $0.10 stamps and 25 $0.10 stamps.
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