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📐 Rule of three online, step by step

Solve a direct rule of three: if one amount matches another, work out the value for a third, step by step and exact.

5 corresponds to

20

Step by step

  1. Direct proportion: if 3 → 12, then 5 → x.
  2. x = (12 × 5) ÷ 3 = 20

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