Question 999687
formula to use here would be rate per hose * number of hoses * time = quantity of water poured into the swimming pool.


since we know number of hoses and time and quantity, we can use that information to solve for rate per hose.


formula becomes:


rate per hose * 3 hoses * 4 hours = 20,000 gallons poured.


solve for rate per hose to get rate per hose = 20,000 / (3 * 4) = 20,000 / 12 = 1666.67 gallons per hour per hose.


the display is rounded.
the number i'm using is not.
that number is stored in the calculator as 1666.666666667.


the formula of rate per hose * 3 hoses * 4 hours = 20,000 gallons poured becomes:


1666.67 * 3 hoses * 4 hours = 20,000 which becomes:


20,000 = 20,000 which confirms the solution of rate per hose is correct.


we have 15,000 gallons left to pour and we are now using 4 hoses.


the same formula of rate per hose * number of hoses * time = quantity of water poured into the swimming pool is used.


this time:


rate per hose is 1666.67
number of hoses is 4
time is what we want to find.
quantity of water poured is 15,000 gallons.


formula becomes:


1666.67 * 4 * time = 15,000


we want to solve for time to get:


time = 15,000 / (1666.67 * 4) which results in:


time = 2.25 hours.


the formula becomes:


1666.67 * 4 * 2.25 = 15,000 which becomes:


15,000 = 15,000, confirming the solution is correct.


the question was how long did it take to pour in the remaining 15,000 gallons.


the solution is that it took 2.25 hours to pour in the remaining 15,000 gallons.