Pick a coin and make it X. Let's use dimes.
Dimes = X
Ly has three more dimes than nickles so...
Nickles = X-3
and twice as many quarters as dimes so ...
Quarters = 2X
For money, dimes are $0.10, nickles are $0.05 and quarters are $0.25
0.10 X + .05 (X-3) + .25 (2x) = 9.60