A
Median of A:80 and median of B= 78.
let x be the sum of no. of class A students and m be the sum of no. of class B students.
x/37 = 82 and m/40= 74
As no. of students is more or less same mean would be little less than 78.
median would be 39th term.
Individually since class A has 37 students 19 students will have marks less than equal to 80.
Individually since class B has 40 students 20 students will have marks less than equal to 78.
Now aligning it in ascending order.
39th term would be 80( median of class A).
So suffucient.
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When nothing seem to help, I would go and look at a Stonecutter hammering away at his rock perhaps a hundred time without as much as a crack showing in it.
Yet at the hundred and first blow it would split in two.
And I knew it was not that blow that did it, But all that had gone Before.