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The average earning of a group of person...

The average earning of a group of persons is `₹ 50` per day. The difference between the highest earning andlowest earning of any two persons of the group is `₹ 45` . If these two people are excluded the minimum earning of the group decreases by `₹1` if the minimum earning of the person in the group between 42 and 47 and the number of persons initially in the group was equal to a prime number with both its digits prime The number of person in the group initially was:

A

29

B

53

C

31

D

none of these

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The correct Answer is:
D
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