Answer: It will take 225 minutes to fill the pool 3/4 full.
Explanation:
A 12,000 gallon pool is being filled at a rate of 40 gallons per minute. To find out how long it will take to fill the pool 3/4 full, we need to first calculate how many gallons of water are needed to fill 3/4 of the pool.
3/4 of 12,000 gallons is 9,000 gallons.
You can use this formula: (1st image)
Substituting the values, we get: (2nd image)
Therefore, it will take 225 minutes to fill the pool 3/4 full.