Cars are made in a factory at a rate of 39 cars every 3 hours. at this rate, how many cars can be made in the factory in 7 hours?
a: 43
b: 91
c: 124

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