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WBCS Preliminary Examination 2021 — General Studies · Question 200 of 200

Q200
ArithmeticRatio, Proportion & Mixtures
The ratio of 6 inch to 4 feet will be
  1. a.1 : 6
  2. b.1 : 4
  3. c.3 : 2
  4. d.1 : 8

Answer: (D) 1 : 8

Convert to the same unit first: 4 feet $=4\times12=48$ inches. Ratio $=6:48=1:8$. A ratio is meaningful only between quantities in the same unit; comparing 6 with 4 directly gives the wrong 3 : 2 (option C). Useful conversions: 1 foot = 12 inches, 1 yard = 3 feet, 1 inch = 2.54 cm, 1 mile = 1,760 yards = 8 furlongs.

Q199 Whole paper