Kim is 4/5 as old as Alan. In four years, she will be 5/6 as old as he will be. How old is each now? (Please show all your work, with statements)

Kim is 16 and Alan is 20

Kim => x

Alan => y

Kim is 4/5 as old as Alan  =>  

In four years, she will be 5/6 as old as he will be =>

Solving the system we obtain x=16 and y=20

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two