Math Question: On a recent trip to the convenience? store, you picked up 4 gallons of? milk, 4 bottles of? water, and 5 ?snack-size bags of chips. Your total bill? (before tax) was ?$27.80. If a bottle of water costs twice as much as a bag of? chips, and a gallon of milk costs ?$1.70 more than a bottle of? water, how much does each item? cost?