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UPSC CSE CSAT 2019 · Paper II (CSAT) · Question 16 · Arithmetic: percentage, ratio, averages, time & work

When a runner was crossing the 12 km mark, she was informed that she had completed only 80% of the…

UPSC Civil Services (Preliminary) Examination 2019, General Studies Paper II (CSAT), Question 16 — Arithmetic: percentage, ratio, averages, time & work.

CSAT 2019 · Q16

Arithmetic: percentage, ratio, averages, time & work X-Ray · Core #5 Easy

When a runner was crossing the 12 km mark, she was informed that she had completed only 80% of the race. How many kilometres was the runner supposed to run in this event?

Answer & explanation

Answer: (b) 15

12 km is four-fifths of the race, so the full distance is 12 × 5/4 = 15 km.

  1. 12 km = 80% of the race.
  2. Race = 12 × 100/80 = 15 km.
  3. Check: 80% of 15 = 12.

Remember · If x is p% of the whole, the whole is x × 100/p.

Question and answer: UPSC's official GS Paper II (2019, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·

Cite this question: UPSC CSE CSAT 2019, Q16 — minimalistias.com/pyqs/csat/2019/q16

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