SOLUTION: A collection of 30 coins worth $5.50 consists of nickels, dimes, and quarters. There are twice as many dimes as nickels. How many quarters are there? please and thank you!!

Question 314797: A collection of 30 coins worth $5.50 consists of nickels, dimes, and quarters. There are twice as many dimes as nickels. How many quarters are there?
please and thank you!!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
N-number of nickels
D-number of dimes
Q-number of quarters
.
.
1.
2.
3.
Substitute eq. 3 into both 1 and 2.

4.
.
.

5.
Multiply eq. 4 by (-1) and add to eq. 5.

Then from eq. 5,

and from eq. 3,

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