In the following Venn diagram, the triangle stands for ‘fathers’, the circle stands for ‘engineers’, the hexagon stands for ‘tax-payers

In the following Venn diagram, the triangle stands for ‘fathers’, the circle stands for ‘engineers’, the hexagon stands for ‘tax-payers’, and the rectangle stands for ‘blood donors’. The given numbers represent the number of persons in that particular category.

How many tax-payers are also blood donors?

A.            38

B.            63

C.            61

D.            55

Sol:

Number of tax-payers who also are blood donors is 27 + 36 = 63