SOLUTION: Stacey's collection has 15 coins in all.Three times as many nickels as dimes. 7 quarters.

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Question 551326: Stacey's collection has 15 coins in all.Three times as many nickels as dimes. 7 quarters.
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
d = dimes
n = nickels
q = quarters
.
d + n + q = 15 coins
.
q = 7
.
d + n = 15 - 7 = 8
.
n = 3*d
.
d + 3*d = 8
4*d = 8
d = 2
.
n = 3*2 = 6
.
done