In a row of boys, If A who is 10th from the left and B who is 9th from the right interchange their positions, A becomes 15th from the left. How many boys are there in the row?
Let's break down the problem step by step.
Initial Positions:
A is 10th from the left.
B is 9th from the right.
After Interchange:
A takes B's position and becomes 15th from the left.
Determine Total Boys in the Row
Since A moves to the position where B was, the 15th position from the left must be B's original position. This means B's original position is the 15th position from the left.
To find the total number of boys in the row, we need to determine the position of B from the left and right:
The total number of boys in the row can be calculated using the formula:
Total number of boys = 15+9-1 = 23
So, there are 23 boys in the row.