If x divided by 9 = 1, how do you know what x is

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

The heaviest 16% of all men in weight weigh more than how many pounds ?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?