The following bar chart shows the no. of college students enrolled in two summer camps A and B from 2015 to 2020.

Blank Bars = A

Line Bars  = B

What is the ratio of students enrolled in camp A in the years 2015, 2017 and 2018 to the students enrolled in camp B in the years 2016, 2019 and 2020?

13 : 18

No. of students in camp A in 2015, 2017 and 2018 = 160 + 140 + 220 = 520

No. of students in camp B in 2016, 2019 and 2020 = 240 + 200 + 280 = 720

Ratio → A : B   →   520  :  720   →   13  :  18