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Thank you InteGrand. A very nice solution!

I made a mistake in the question; I have edited it so that it is "no more than 4/7"

I think can assume that the number of boys is non zero

I need help with this question I was given: A class went on two trips. Every student in the class attended at least one of the two trips. In each trip, no more than 2/5 of the class were boys. Prove that no more than 4/7 of the class are boys. Thanks.

Hi im Cryptical (Aaron) Im doing English Extension 1, Mathematics Extension 1, Physics, Chemistry, Music 2 and Ancient History :)