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Direct and inverse proportion
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Learn it Direct: y = kx (double one, double the other). Inverse: x × y = constant (double the workers, half the days).
Example: 4 painters take 9 days. How long would 6 painters take?
- Inverse proportion: total work = $4 \times 9 = 36$ painter-days.
- $36 \div 6 = 6$ days.
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