How would you write this word problem as an equation? when the gas gauge on her car was on the 3/8 mark, karen pumped 15 gal. of gas into the tank in order to fill it. how many gal. of gas does the tank in karen's car hold?

The water company charges a residential customer $41 for the first 3,000 gallons of water used and $1 for every 200 gallons used over 3000 gallons. if the water bill was $58 how many gallons of water were usedanswersa 3400 gallonsb 6000 gallonsc 6400 gallons d 7000 gallons