The sum of the digits of a two digit number is 9 If the digits are reversed the new number is 9 more that the original number. What is the original number ?

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?

Guys i really need or i have to stay late up night

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?