Jacy has a collection of 140 coins worth $19.00. She has only nickels, dimes, and quarters. The difference in thenumber of dimes and the number of quarters is 10. How many nickels are in Jacy's collection?

N + D + Q = 140................................(1) 0.05N + 0.10D + 0.25Q =19..............(2) Q - D = 10..........................................(3) Solve for N, D, Q by using substitutions: