Let the students who have opted for Computer and are interested in quiz be

*x*.

∴The number of students who have opted for Computer and are interested in debate = 2

*x*/3

Since each student is either interested in debate or quiz the union of these two sets represents the total number of students who have opted for Computer.

Now the number of students who have taken Hindi is twice the number of students who have chosen Computer and are interested in quiz.

∴

*x* = 15

∴The number of students who have opted for Hindi = 55 − 5(15/3) = 30

Hence, option 1.