The pie chart given below shows the number of girls in six schools. The total number of girls in all these six schools are 5000. Number of girls in a particular school is shown as a percentage of total number of girls in all these six schools.

What is the ratio of number of girls in school A to the number of girls in school E ?

10 : 9

Girls in school A  :   Girls in school E

          20%         :         18%

            10          :           9