Question 316842
let the number of nickels be x
quarters = y
1. y=3x
..
x+31+y-5 = x+y /2
x+y+26 =x+y /2
2x+2y+52=x+y
x-y=-52
2. x-y=-52
plug value of y in eq 2

x-3x=-52
-2x=-52
x=-52/-2
x=26  nickels
quarters = 3*26=78