One quarter, 10 cents
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The easiest way is to convert everything to cents first. - Seven nickels = 35 cents - Two quarters = 50 cents - so 7 nickels to 2 quarters is the same as 35/50, or 0.7 as a decimal number.
4 quarters = 1 dollar = 100 cents
$3 would be 12 quarters, 35 cents would contain one quarter and one dime. So your answer would be 13 quarters and 1 dime.
3 Quarters... Otherwise, 75 cents.
The algebraic formula for this problem has the form 25x + 10(35-x) = 515 where x is the number of quarters (times 25 cents) and (35-x) is the number of dimes (times 10 cents) With the result that 25x + 350 - 10x = 515, yielding 15x = 165, and x = 11 So James has 11 quarters and 24 dimes, (2.75 and 2.40) equalling $ 5.15 total.