Ranking test – shift and convert ends: 37 boys stand in a row facing the building. Ashwini is 15th from the left end. He moves six places to the right. What is his new position from the right end?

Introduction / Context:
We perform an intra-row shift (left-to-right) and then convert left-rank to right-rank using the standard identity. Facing direction is uniform, so “left/right” are consistent.

Given Data / Assumptions:

• Total N = 37.
• Initial left-rank = 15.
• Shift right by 6 positions ⇒ new left-rank = 21.

Concept / Approach:
After the shift, compute new right-rank via: position_from_right = N − position_from_left + 1.

Step-by-Step Solution:

Verification / Alternative check:
Counting to the right of the new position: there are 16 persons (ranks 22 to 37), so Ashwini is 17th from the right—consistent with the formula.

Why Other Options Are Wrong:
16th/18th/20th/21st do not match 17 obtained from the identity and direct counting. Hence, among the given choices, the only accurate selection is “None of these.”

Common Pitfalls:
Forgetting the +1 term; misapplying shift direction; assuming facing reverses left/right (it does not change within a single row).

Final Answer:
None of these