Question

In a row of people, P is second from the left and R is 16th from the right. If P and R interchange their positions, P
becomes 12th from the left. How many people are there in the row?​

Answer 1

Answer:

In a row of people, P is second from the left and R is 16th from the right. If P and R interchange their positions, P becomes 12th from the left. How many people are there in the row ?

_____________________________

Solution:

According to the first condition:

» P is the second from left and R is 16th from the right.

» R is 16th from the right hence there are 15 people more ahead of P.

On interchanging,

» P becomes 12th from the left.

i.e. there are 11 more people behind P.

Therefore, there are 11 + 1 + 15 people in a row, i.e. there are 27 people in the row.

Answer 2

Given : In a row of people,

P is second from the left and

R is 16th from the right.

If P and R interchange their positions, P becomes 12th from the left.

To Find : How many people are there in the row​?

Solution:

P is second from the left and R is 16th from the right.

hence 1 is on left side of P

and 15 are on right side of R

 1  P  ---------------    R ------- 15 -----------

P and R interchange their positions,

=> hence 1 is on left side of R

and 15 are on right side of P

  1  R  ---------------    P ------- 15 -----------

becomes 12th from the left.

Hence 11   on left side of P

=>   ------11  ------ P ------- 15 -----------

11 on left side of P and 15 on right sides of P and P himself

so total  = 11 + 1 + 15

= 27

27 people are in row.

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