The average weight of a group of boys is 30 kg. After a boy of weight 37 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally ?	Choose the correct choice from the following answers:
A) A)4  B) B)8  C) C)6  D) D)2  E) E)1
Let the number off boys in the group originally be x.   Total weight of the boys = 30x   After the boy weighing 37 kg joins the group, total weight of boys = 30x + 37   So 30x + 37 = 31(x + 1) = &gt; x = 6.   Answer:6
<result>C</result>
The average weight of a group of boys is 30 kg. After a boy of weight 37 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally ?