SOLUTION: $1.50 made up of nickels and dimes. You have twice as many nickels than dimes. How many nickels are there?

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Question 1085749: $1.50 made up of nickels and dimes. You have twice as many nickels than dimes. How many nickels are there?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
n nickels
d dimes

5n%2B10d=150
n%2B2d=30


n%2Fd=2
n=2d

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System of equations
system%28n%2B2d=30%2Cn-2d=0%29
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.
.

Your description does not seem to work.

Answer by ikleyn(52884) About Me  (Show Source):
You can put this solution on YOUR website!
.
The condition is DEFECTIVE.

With this condition, the solution does not exist.