Question 257007
We are dealing with pennies nickels and quarters. So we need at least three equations
p+n+q=141
5n+p+25q=1517
q=p+15
q=n-15
n=62 p=32 q=47
We only needed three equations.

I did it with just the first three equations and got those answers.
I did it with all four equations and got the same answers.