SOLUTION: I need a walkthrough on a word problem ( i think they are called trinomeals)... i understand how to do the problem, but whenever i have to write a problem out of a word problem i g

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Question 676951: I need a walkthrough on a word problem ( i think they are called trinomeals)... i understand how to do the problem, but whenever i have to write a problem out of a word problem i get stuck.
Here is the Word Problem:
"A change machine contains nickels, dimes, and quarters. There are 75 coins in the machine, and the value of the coins is $7.25. There are five times as many nickels as dimes. Find the numbers of coins of each type in the machine."
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Establish variables
n = nickels
d = dimes
q = quarters
...
Given equations
n+d+q = 75
.05n + .1d + .25q = 7.25
n = 5d
...
Substitute the third equation into the first equation
5d + d + q = 75
6d + q = 75
q = 75 - 6d
...
Substitute into the second equation
.05(5d) + .1d + .25(75-6d) = 7.25
.25d + .1d + 18.75 - 1.5d = 7.25
-1.15d = 7.25 - 18.75
-1.15d = -11.5
highlight_green%28d+=+10%29 dimes
...
n = 5(10) = highlight_green%28n=50%29nickels
...
q = 75 - 6(10) = 75 - 60 highlight_green%28q=15%29 quarters
.....................
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-Reading Boosters
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