FIND THE PERCENTAGE OF THE PART 15% of 30 of what number???

PL EXplain

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

What’s the answer ? use the picture to see the problem

What function has a range {yly< 5}? question on picture above^