Question

In a row of students, Rina is 12th from the left and 9th from the right. How many students are there in the row?

• A. 20
• B. 21
• C. 19
• D. 22

Hint:

To find total number of students from positions at both ends, add both positions and subtract 1.

Answer 1

The Correct Option is A

Step 1: Identify Rina’s position from the left side, which is 12th.
Step 2: Identify Rina’s position from the right side, which is 9th.
Step 3: When counting total students in a row where one person's position from the left and right are given, use the formula:
\[ \text{Total students} = \text{Position from left} + \text{Position from right} - 1 \] Step 4: Substitute the values:
\[ = 12 + 9 - 1 = 20 \] Step 5: Therefore, the total number of students in the row is 20.