In a school, total number of students in...

In a school, total number of students in 10 A division is equal to the total number of students in 10 B. One students is to be selected from each division. Number of boys in 10A is 20. The probability of selecting a boy from 10 A is `2/5` and that of from 10 B is `3/5`. How many students are there in 10A?

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