SOLUTION: a collection of dimes and nickels is worth 1.55. There are 21 coins in all. How many of each are there?

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Question 1059685: a collection of dimes and nickels is worth 1.55. There are 21 coins in all. How many of each are there?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
10D%2B5N=155<--- Total value in cents
1.2D%2BN=31
.
.
.
2.D%2BN=21<--- Total number of coins
.
.
.
Subtract eq. 2 from eq. 1,
2D%2BN-D-N=31-21
D=10
So then,
10%2BN=21
N=11