# From his last trip, Carl knows that his car's mileage is 22 miles per gallon of gas. How many gallons will he use if he is planning a 668-mile roundtrip? Use the formula d= rg. Where d is the distance, r is the rate in miles per gallon, and g is the number of gallons of gas

The required amount would be 31 gallons, rounded up. Step-by-step explanation: To find the amount needed, we calculate the total volume of the pool by multiplying its length, width, and depth. Let's say the pool measures 10 feet by 20 feet and has a depth of 5 feet. Volume = length x width x depth Volume = 10 ft x 20 ft x 5 ft Volume = 1000 cubic feet Since one cubic foot of water equals approximately 7.48 gallons, we can find out how many gallons the pool can hold by multiplying the volume by this conversion factor. Gallons = volume x 7.48 Gallons = 1000 cubic feet x 7.48 gallons per cubic foot Gallons = 7480 gallons However, we need to account for the fact that the pool water may not fill up to the brim. Assuming an average of 90% fill for the pool, we multiply the total gallons by 0.9. 90% Fill = 7480 gallons x 0.9 90% Fill = 6732 gallons Finally, we need to account for any water displaced by the pool's shape or accessories. This is where rounding up comes into play. Adding a small buffer is always a good idea to avoid running out of water during the filling process, so we round up the final amount to 31 gallons as a safe estimate.