SOLUTION: Joe had twice as many nickels as dimes. Altogether he had $4.20. How many nickels and how many dimes does Joe have?

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Question 129532: Joe had twice as many nickels as dimes. Altogether he had $4.20. How many nickels and how many dimes does Joe have?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let d = number of dimes
Let n = number of nickels
n+=+2d
5n+%2B+10d+=+420
5%2A%282d%29+%2B+10d+=+420
20d+=+420
d+=+21
n+=+2d
n+=+42
Joe has 42 nickels and 21 dimes
check answer:
5n+%2B+10d+=+420
5%2A42+%2B+10%2A21+=+420
210+%2B+210+=+420
420+=+420
OK