SOLUTION: Every evening Jenna empties her pockets. And puts her change in a jar at the end of the week she counts her money. One week she had 40 coins all dimes and quarters. When she added
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Question 944600: Every evening Jenna empties her pockets. And puts her change in a jar at the end of the week she counts her money. One week she had 40 coins all dimes and quarters. When she added them up she had a total of 7.75. How many dimes where there
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
One week she had 40 coins all dimes and quarters. When she added them up she had a total of 7.75. How many dimes were there?
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Equations:
d + q = 40 coins
10d + 25q = 775 cents
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Modify for elimination::
5d + 5q = 200
2d + 5q = 155
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Subtract and solve for "d"::
3d = 45
d = 15 (# of dimes)
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Cheers,
Stan H.
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