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Averages, mixtures & alligation formulas
5 formulas for Averages, mixtures & alligation, from the Arithmetic & Quantitative Aptitude section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Average | Sum of observations / Number of observations | |
| Average of first n natural numbers | (n + 1) / 2 | |
| Weighted average | (n₁a₁ + n₂a₂) / (n₁ + n₂) | |
| Alligation rule | Cheaper : Dearer = (d − m) : (m − c) | c cheaper price, d dearer price, m mean price |
| Repeated replacement | Final pure = Initial × (1 − x/V)ⁿ | x removed and replaced n times from volume V |
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