A form class of 25 students all study different subjects. They each study at least one humanity: English, History, Geography, Philosophy, but no one studies more than 3 of these. 80% study English, 40% study Geography, 16% study Philosophy and 28% study History.
Here are some statements:
A At least 3 students must study English and History
B There may be no students who study English and Philosophy
C No more than 6 students study History and Geography