The ratio of males to females in a particular school is 4:5. How many male students are there?

Source: Magoosh

The ratio of males to females in a particular school is 4:5. How many male students are there?

1) If the number of girls increased by 20%, then males would constitute 40% of this larger student body

2) If 10 more male students joined the school, the new ratio of males to females would be 9:10

The OA is B

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