Question 590753
there are three unknowns (nickels, dimes, quarters), so you need three equations


5n + 10d + 25q = 375


q = d + 3 ___ q - 3 = d


n = 2q



you can solve the system by substituting ___ 5(2q) + 10(q - 3) + 25q = 375 ___ 10q + 10q - 30 + 25q = 375 ___ 45q = 405


solve for q, and then substitute back to find n and d