Question

Can you please help me with 22.? (BE SERIOUS) (ITS DUE TOMORROW)

Answer 1

pool has 45000 gallons.  It loses 780 gallons per hour, so the amount at any given time:

45000 - 780h, where h is the number of hours.

The chemical could be added once the amount of gallons in the pool hits 15000. So the equation to solve:

45000 - 780h = 15000

solve:

30000 = 780h

38.46 = h

It will take about 38.46 hours before chemical could be added.  It will not take longer than 2 days because 2 days is 48 hours, and we only need about 38 hours.