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kirill [66]
3 years ago
9

Peggy had three times as many quarters as nickels. She had $1.60 in all. How many nickels and how many quarters did she have? Wh

ich of the following equations could be used to solve the problem?
Mathematics
1 answer:
svlad2 [7]3 years ago
3 0
Let q and n represent the number of quarters and nickels respectively.

q=3n and .05n+.25q=1.6  These are the conditions in mathematical terms.

To solve, use the value of q from the first equation in the second equation to get:

.05n+.25(3n)=1.6  carry out indicated multiplication on left side

.05n+.75n=1.6  combine like terms on left side

.8n=1.6  divide both sides by .8

n=2, since q=3n

q=6

So Peggy had 2 nickels and 6 quarters.
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Ya, calculus and related rates, such fun!




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altitude rate will be dh/dt and that is 1cm/min
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