Plz help on 55 if you can!!

It takes a total of 6 hours to fill up an inground backyard pool using a standard house. a function can represent this situation to represent the amount of water in the pool until it is full a function of time the hose is running. determine the domain for the function

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu