Problem B. 4212. (November 2009)
B. 4212. In a cinema, 80% of the grownup spectators are men, 40% of the male spectators are children, and 20% of the children are boys. What is the minimum possible number of spectators?
Suggested by J. Pataki, Budapest
(3 pont)
Deadline expired on 10 December 2009.
Statistics:
224 students sent a solution.  
3 points:  194 students. 
2 points:  9 students. 
1 point:  12 students. 
0 point:  6 students. 
Unfair, not evaluated:  3 solutions. 
