GCE Mathematics 1990 Question 49

Two groups of male students cast their vote on a particular proposal. The results are as follows:
Group A: In favour 128, Against 32
Group B: In favour 96, Against 48
If a student in favour of the proposal is selected for a post, what is the probability that he is from group A?

1. A.8/19
2. B.16/35
3. C.10/19
4. D.4/7
5. E.4/5