1 General Mental and Psychological Abilities · 1.3.2 Ratio, ages, averages and mixtures

1.3.2.7 Chain rule: men, days, hours and work in proportion

When several quantities change together, link each one to the unknown as direct or inverse, multiply the ratios in a chain, or use the single formula M₁D₁H₁/W₁ = M₂D₂H₂/W₂.

  • APPSC Group 1
  • Advanced level
  • 7 min read
  • Full course

Key terms

  • chain rule
  • compound proportion
  • man-days
  • man-hours
  • M1D1H1/W1 = M2D2H2/W2
  • provisions
  • exchange chain
  • efficiency

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Common trapsFoundation
  5. Quick revisionFoundation

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