Question 947536
n, d, q the coins


{{{system(3/2=d/n,q=n-5,0.05n+0.1d+0.25q=5.05)}}}


Examine these equations for a while and you could think of a solution strategy.


Solve the first two equations in terms of n.  They are of two variable each.
Simplify the money count, last or third equation.  Substitute for d and q in the money count equation and first solve for the value of n.