SOLUTION: Draw .75 cents using 50 coins

Question 849501: Draw .75 cents using 50 coins
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Draw .75 cents using 50 coins
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Value: p + 5n + 10d = 75 cents
Quantity: p + n + d = 50 coins
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Modify:
p = 75-(5n+10d)
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Substitute:
75 -5n - 10d + n + d = 50
-4n - 9d = -25
4n + 9d = 25
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4n value: 4,8,12,16
9d values: 9,18
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9 + 16 = 25
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Ans:
n = 4(# of nickels)
d = 1(# of dimes)
p = 75-(5n+10d) = 75-(20+10) = 45 (# of pennies)
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Cheers,
Stan H.
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