Chain Rule
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Quantitative Aptitude - Chain Rule
Use chain rule to relate variables via intermediate ratios.
1. Core Concept
If A:B = x and B:C = y, then A:C = x×y.
2. Applications
- Unit conversion (e.g., cost per kg → cost per g).
- Linked averages (e.g., cost per dozen to per piece).
3. Quick Tips
- Write step-by-step ratios and cancel common terms.
- Use sequential multiplication of conversion factors.
4. Common Errors
- Reversing ratios incorrectly.
5. Revision Checklist
- Master chaining of 3+ ratios.
Summary: Multiply sequential ratios to find indirect relations; treat units as variables, cancel consistently, and simplify final ratio.
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