Logical Reasoning

Ranking

Medium

In a row of boys, if A who is tenth from the left and B who is ninth from the right, interchange their positions, A becomes fifteenth from the left. How many boys are there in the row?

✅ Correct Option: 1

Initially, A is 10th from the left and B is 9th from the right.

After A and B interchange their positions, A becomes 15th from the left.

Since A moves to B's original position, B's original position must be 15th from the left.

Therefore, B is both:

15th from the left
9th from the right

For any person in a row:

Total number = (Position from left) + (Position from right) - 1

Total number of boys $= 15 + 9 - 1$

Total number of boys $= 23$

Therefore, there are 23 boys in the row.

The answer is Option 1: 23.

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In a row of boys, if A who is tenth from the left and B who is ninth from the right, interchange their positions, A becomes fifteenth from the left. How many boys are there in the row?

Solution

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