In a queue P is eighteenth from the front while Q is sixteenth from the back. If R is twentieth from front and is exactly in the middle of P and Q, then how many persons are there in the queue?
Answer & explanation
Correct answer: option 2
we know,
(position of P from Left + position of Q from Left)/2 = middle position of R from Left
(18 + Q)/2 = 20
18 + Q = 40
therefore,
position of Q from Left is 22
and we know,
Total = Left Rank of Q + Right Rank of Q - 1
Total = 22 + 16 - 1
Total = 37