Problem B. 4212. (November 2009)
B. 4212. In a cinema, 80% of the grown-up 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 December 10, 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 solutionss.
Problems in Mathematics of KöMaL, November 2009