Question

Geardo has $2.50 in quarters, dimes, and nickels. If he has 18 coins how many of each chin does he have?

Answer 1

10d + 25q + 5n = 250 (cents) 
5(2d + 5q + n) =250 
2d + 5q + n = 50 

d + q + n = 18 (coins) 

Three unknowns and two equations ==> many answers