In a school, the total number of student...

In a school, the total number of students in 10 A division is equal to the total number of students in 10 B. One student is to be selected from each division. Number of boys in 10 A 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 10 A?

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