Answer: 160 quarters
Work Shown:
1 quarter = 0.2 oz
10 quarters = 2 oz .... multiply both sides by 10
80 quarters = 16 oz .... multiply both sides by 8
80 quarters = 1 pound
160 quarters = 2 pounds .... multiply both sides by 2
Side note: 160 quarters is worth 160*0.25 = 40 dollars.