A pool tank fills 60 gallons of water in 1/5 of an hour. How many gallons of water can be filled up in 1 hour?

From 1/5 to 1 hour is * 5 so 1/5*5 = 5/5

60*5 = 300 gallons in 1 hour

If it takes 1/5 hour to fill 60 gallons

than multiply the fraction by 5 to get a whole hour

and multiply the 60 gallons by 5 to get the amount of water created in that hour

60*5 = 300 gallons of water in 1 hour