Answers

2015-04-12T14:27:14+05:30
Let the number of judges be x, then from the given information we have n(A) = \dfrac{x}{2},  n(B) = \dfrac{2x}{3},  n(A \cap B) = 10 and  n(A' \cap B') = 6 

 x = n(A) + n(B) - n(A\cap B) +n(A'\cap B') 
 x = \dfrac{x}{2}+ \dfrac{2x}{3}- 10+6 

It is easy to solve x.
1 5 1