Question

Twenty-five children are standing in a row. “R” is in 16th place from the right end and “B” is in 18th place from the left end. How many children are there between “R” and “B”?

• A. 2
• B. 4
• C. 5
• D. 7

Hint:

In such problems, always convert positions from one end to the other, and then calculate the distance between them.

Answer 1

The Correct Option is D

Given:
- There are 25 children in total.
- R is in 16th place from the right end, meaning R is at the \( 25 - 16 + 1 = 10 \)th position from the left end.
- B is in 18th place from the left end.
Now, the number of children between R and B is:
\[ \text{Number of children between R and B} = 18 - 10 - 1 = 7 \] Thus, there are 7 children between R and B.

Answer 2

Total number of children = 25
Position of R from the right end = 16
Position of B from the left end = 18

Step 1: Convert R's position from the right to position from the left
Position of R from the left = Total children - Position from right + 1
= 25 - 16 + 1 = 10

So now we have:
Position of R from the left = 10
Position of B from the left = 18

Step 2: Find the number of children between R and B
Number of children between = |18 - 10| - 1 = 8 - 1 = 7

Conclusion:
There are 7 children between R and B.