Directions : Given below is no. of male & female students in classes A, B & C. some data are missing which you have to calculate as per instructions provided. 

           A     B     C

Boys  50   --     --

Girls  --    80    60

NOTE:

(i) probability of selecting a boy from class A is 5 12 .

(ii) probability of selecting a boy from all the boys of all classes is 14 19 such that the boy selected is either from class B or class C.

(iii) probability of selecting a boy from class B is equal to probability of selecting a boy from class C.