Question

Susan has $4 in nickels and quarters. She has 4 more quarters than nickels. How many of each does she have?

Answer 1

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Answer 2

system of equations

.05n + .25q = 4
q = n + 4

Okay with this?

Answer 3

For checking the answer without pen and paper:
take out the 4 extra quarters, or $4-4*0.25=$3
Now quarters and nickels are in equal numbers to make $3, or $3/(0.25+0.05)=10 of each.
So 10 nickels and 14 quarters.