Maths
posted by John .
I can't understand this math problem....
Please help me....

Problem: In a boys' school, 5/8 of the boys play football and 4/7 play rugby. If every boy plays at least one of the two games, find the fraction of the boys who play both

since 5/8+4/7 = 67/56, 11/56 play both
check: with 56 students,
35 play football
32 play rugby
so, 11 play both, since all play something.
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