SOLUTION: A jar has only nickles and dimes. There are three times as many nickles as dimes and a total of $25. How many of each coin are in the jar?

Question 1017781: A jar has only nickles and dimes. There are three times as many nickles as dimes and a total of $25. How many of each coin are in the jar?
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
n = 3d
0.05n+0.10d = 25 substitute for n
0.05(3d)+0.10d = 25
0.15d+0.10d = 25
0.25d = 25
d = 100
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
n/3 = d
0.05n+0.10d = 25 substitute for d:
0.05n+0.10(n/3) = 25
0.15n+0.10n = 75
0.25n = 75
n = 300
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Check:
d = 100*0.10 = 10
n = 300*0.05 = 15
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Total. . . . . 25 We have the correct answer
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