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Solve direct and inverse proportions with the rule of three. Find the unknown value instantly.
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The rule of three is a method for finding an unknown value in a proportion. Direct proportion: if A increases, B increases proportionally. Inverse proportion: if A increases, B decreases. Example: if 5 workers build a wall in 10 days, how long for 3 workers? (inverse: 5×10÷3 ≈ 16.7 days)