SOLUTION: i have 36 coins all of which are 5 cent or 10 cent if the total value is 3.20 how many are 5 cent

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Question 1010716: i have 36 coins all of which are 5 cent or 10 cent if the total value is 3.20 how many are 5 cent
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call them n and d. Then we have
n + d = 36 and
5n + 10d = 320 (we work in cents)
Let us multiply the top by 10 and subtract giving us
5n + 10d = 320
-(10n + 10d = 360)
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-5n = -40
n = 8 nickels