WAEC Mathematics 1992 Question 49

The data below shows the number of workers employed in the various sections of a construction company in Lagos.
Carpenters 24, Plumbers 12, Painters 9, Bricklayers 18, Labourers 27, Plasterers 15, Messengers 3
If one of the workers is absent on a certain day, what is the probability that he is a bricklayer?

1. A.1/12
2. B.1/9
3. C.2/9
4. D.1/6
5. E.1/4