The ratio of donors blood group ‘A’ to the average of the donors group ‘O’, ‘B’ and ‘AB’ is:

The ratio of donors blood group ‘A’ to the average of the donors group ‘O’, ‘B’ and ‘AB’ is: Correct Answer 3 : 4

Average of O, B, AB blood group
$$\eqalign{& = \frac{100.8° + 129.6° + 57.6°}{3} \cr& = \frac{288°}{3} \cr& = 96° \cr& \therefore \text{Required ratio} \cr& = 72° : 96° \cr& = 3 : 4 \cr} $$
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