Question

In a row of boys if A who is ${10}^{th}$ from the left and B who is $9^{th}$ from the right interchange their positions A becomes ${15}^{th}$ from left How many boys are there in the row?

• A. 23
• B. 27
• C. 28
• D. 31

Answer 1

The correct option is A 23

By interchanging positions A becomes ${15}^{th}$ position
Number of boys in the row = 15 + 9 - 1 = 23
So the answer is (1)