SOLUTION: we have 100 coins, a mixture of nickels and dimes, with a total value of $8.20. how many of each type of coin do we have? how would I go about solving this?

Question 945570: we have 100 coins, a mixture of nickels and dimes, with a total value of $8.20. how many of each type of coin do we have?
how would I go about solving this?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
"we have 100 coins, a mixture of nickels and dimes"

so we know that where

n = number of nickels
d = number of dimes

you can solve for either variable. I'm going to solve for d:

----------------------------------------------------------------------

The total value of the coins is $8.20, so we also know

Plug in

Keep going to solve for n. I'll let you do that. Once you find the value of n, you plug it into to get the value of d.
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