Question 614522
let x be the number of quarters and y be the number of 50-cents pieces... then the change was 9.5 and the equations become {{{x+y=30 and 0.25x+0.5y=9.5}}} then {{{0.25(30-y)+0.5y=9.5}}} then {{{7.5-0.25y+0.5y=9.5}}} then {{{0.25y=2.5}}} so y=8 and x=22