Rahul ranked 16th from the top and 29th from the bottom among those who passed the examination. Six boys did not participate in the examination and five failed. How many boys were there in the class?

Correct option is A

Total Number of Boys in the class = 16 +29-1 +6 +5 =55
We subtracted 1 otherwise it would have been counted Twice and we will add number of boys failed and the boys which didn’t appeared in exam to get total number of boys