Jackson loves to take day trips during weekends. Last weekend, he drove 80 miles to Crabclaw Beach. He used 4 gallons of gas to get there. This weekend, he will drive 100 miles to get to Mount Highmore.
If he uses gas at the same rate, how many gallons of gas will Jackson use to get to Mount Highmore?
gallons
If Jackson used 4 gallons of gas to drive 80 miles, then he uses 4/80 = 1/20 gallons of gas per mile.
To drive 100 miles, he will need 1/20 x 100 = 5 gallons of gas. Answer: \boxed{5}.