SOLUTION: Manny has a collection of 72 coins, all nickes and dimes, that totals $6.20. What is the total amount of money he has found in dimes.

Algebra ->  Graphs -> SOLUTION: Manny has a collection of 72 coins, all nickes and dimes, that totals $6.20. What is the total amount of money he has found in dimes.      Log On


   



Question 1008503: Manny has a collection of 72 coins, all nickes and dimes, that totals $6.20. What is the total amount of money he has found in dimes.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.N%2BD=72
.
.
.
2.5N%2B10D=620
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.
.
From 1,
5N%2B5D=360
Subtract from 2,
5N%2B10D-5N-5D=620-360
5D=260
So then the total from dimes is 10D or
10D=520
$5.20 from dimes.