In february, paul's electric bill was three dollars more than one-half his gas bill. if the electric bill was ninety-two dollars, what was the gas bill?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?