A plane has 360 total seats, which are divided into economy class business class. For every 13 seats in economy class, there are 5 seats in the business class. How many seats are there in each class?

360 / (13+5) = 20

when economy class has 13 seats,

business class will have 5seats,

so we can plus two classes seats,

than divided. it will became 20part

20*13=260

economy class has 260 seats

20*5=100

business class will has 100 seats