SOLUTION: postal cards sells some 15cents stamps and some 25cents stamps altogether they sold 10 stamps at a total of $1.70 how many of each stamps did they sell
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Question 941219: postal cards sells some 15cents stamps and some 25cents stamps altogether they sold 10 stamps at a total of $1.70 how many of each stamps did they sell
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
postal cards sells some 15cents stamps and some 25cents stamps altogether they sold 10 stamps at a total of $1.70 how many of each stamps did they sell
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Quantity:: f + t = 10 stamps
Value::: 15f +25t = 170 cents
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Modify for elimination::
3f + 3t = 3*10
3f + 5t = 34
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Subtract and solve for "t"::
2t = 4
t = 2 (# of 25 cent stamps sold)
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Solve for "f"::
f + t = 10
f + 2 = 10
f = 8 (# of 15 cent stamps sold)
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Cheers,
Stan H.
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