Consider a group comprising of 4 students-Reena, Beena, Meena and Neena, who stand in a row. Reena and Beena stand in sixth and seventh position, respectively from the left. Meena and Neena stand in the fourth and fifth positions, respectively from the right. When Beena and Meena exchange their positions, then Beena will be fifteenth from the left.
Originally, Neena's position from the left is

Options

A. 5
B. 13
C. 14
D. 16

Explanation

To solve the problem step by step, we will analyze the positions of the students based on the information provided.

### Step 1: Understand the positions from the left and right
- Reena is in the 6th position from the left.
- Beena is in the 7th position from the left.
- Meena is in the 4th position from the right.
- Neena is in the 5th position from the right.

### Step 2: Determine the total number of students
When Beena and Meena exchange their positions, Beena becomes 15th from the left. We can use this information to find the total number of students in the row.

Let’s denote:
- Position of Beena from the left after exchange = 15
- Position of Meena from the right = 4

Using the formula:
\[ \text{Total number of students} = \text{Position from left} + \text{Position from right} - 1 \]

Substituting the values:
\[ \text{Total number of students} = 15 + 4 - 1 = 18 \]

### Step 3: Find Neena's position from the left
We know Neena's position from the right is 5. We can now find Neena's position from the left using the total number of students.

Using the formula again:
\[ \text{Total number of students} = \text{Position from left} + \text{Position from right} - 1 \]

Let Neena's position from the left be \( x \):
\[ 18 = x + 5 - 1 \]
\[ 18 = x + 4 \]
\[ x = 18 - 4 \]
\[ x = 14 \]

### Conclusion
Neena's position from the left is 14th.