SOLUTION: Paul has 35 coins consisting of dimes and nickels. The value of his coins is $3.30 How many of each type does he have?

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Question 565693: Paul has 35 coins consisting of dimes and nickels. The value of his coins is $3.30 How many of each type does he have?
Answer by ad_alta(240) About Me  (Show Source):
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Let 'd' be the number of dimes and 'n' the number of nickels. Then 10d+5n=330 and d+n=35. Substituting the second equation into the first we get 10(35-n)+5n=330. So Paul has n=4 nickles and 31 dimes.