The fraction of those who were cast and got major roles is 1/5.
The number of the students who were cast out of the Ninety students auditioned for the school play is calculated as follows;
Total number of students = 90
Number of students who were cast = ¹/₃ x 90 = 30
Number of students who go major role = 6
The fraction of those who were cast and got major roles is calculated as follows;
fraction of students who got major role = 6/30
fraction of students who got major role = 1/5
Thus, the fraction of those who were cast and got major roles is 1/5.
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