Question

In a row of 40 children, R is 11th from the right and there are 15 children between R and M. What is M's position from the left end of the row? 

• A. 14th
• B. 15th
• C. 13th
• D. Can't be determined
• E.

Hint:

Always check whether the positions given in the problem make sense based on the total number of elements in the set.

Answer 1

The Correct Option is A

Step 1: R's position from the left is \( 40 - 11 + 1 = 30 \).

Step 2: Placing M 15 positions to the right of R would give \( 30 + 15 + 1 = 46 \), which exceeds the row of 40, so M must be to the left of R instead.

Step 3: M's position from the left is \( 30 - 15 - 1 = 14 \).
\[ \boxed{14} \]