The following bar chart shows the number of students enrolled in two Summer Camps A and B from 2014 to 2019.

Study the chart carefully and answer the question that follows.

What is the ratio of the students enrolled in Camp A in 2014, 2016 and 2017 to the students enrolled in camp B in 2015, 2018 and 2019 ?

13 : 18

Students in camp A in 2014 , 2016 & 2017   :  Students in camp B in 2015 , 2018 & 2019

              ( 160 + 140 + 220 )                    :     (240 + 200 + 280 )

                          520                                :             720

                          13                                  :             18