Can u help me with this pls

If a =6, what is the value of 2a(3b + 5c)?

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

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?