17. To solve this problem, we need to get first the volume of the swimming pool. We assume that the swimming pool takes a rectangular prism shape. The volume of the pool can be calculated using the equation
The pool has dimensions 10 feet wide, 30 feet long, and 5 feet deep. Substitute this on the equation above and solve, we get
Now, we are asked how many gallons of water would it take to fill the swimming pool. Assuming that the water completely fills up the pool, we have a number of gallons equal to the volume of the pool. Since the volume of the pool is in cubic feet, we need to convert this into gallons. The conversion factor for cubic feet to the gallon is 1 cubic foot = 7.48 gallons. We have
Answer: We require 11220 gallons of water to fill up the pool.
18. If the cost of the water per gallon is $0.07, we just multiply this by the total volume of gallons of water that filled up the pool. We have
Answer: The total cost to fill the pool is about $785.4.