Question 27642
Let quarters be y
Let nickels be x
Nickel value x 100 = 5
Quarter value x 100 = 25
total value x 100 = 725


x+y=57
y=57-x (subsition)


5x+25y=725
5x+25(57-x)=725
5x-25x+1425=725
-20x=-700
x=35


y=57-35
y=22


Hence, he has 35 nickels and 22 quarters.
Paul.