In a row deepak is 7th from the left and monish is 12th from the right .If they interchange their places among themselves, then deepak becomes 20th from the left. how many boys are there in the row .
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monish initial position from right=12th
monish initial position from left=20th
Total no of students=20+12-1
=31
we are subtracting it from 1 because if we don't do it monish will be counted twice
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