SOLUTION: Please help! A collection of 40 dimes and nickels is worth $2.90. How many nickels are there? (hint: In your equation, use 290 cents instead of $2.90.)

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Question 215840: Please help!
A collection of 40 dimes and nickels is worth $2.90. How many nickels are there? (hint: In your equation, use 290 cents instead of $2.90.)
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
d+n=40
d=40-n
10d+5n=290
10(40-n)+5n=290
400-10n+5n=290
-5n=290-400
-5n=-110
n=-110/-5
n=22 nickles.
40-22=18 dimes.
Proof:
10*18+5*22=290
180+110=290
290=290