Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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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.


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.

Problems in Mathematics of KöMaL, November 2009