Mixture Alligation Scale
GMAT glossary · Quantitative Reasoning
Definition
Seesaw / alligation scale for blending two concentrations or prices to a target (same move as Balance Method).
Mixture Alligation Scale in plain English
The Mixture Alligation Scale is the Balance Method (Alligation Seesaw). Put the two pure values on the ends, the target in the middle, and cross-read opposite gaps as part counts. Clues include mixture, blended rate, tiered commission, alligation. Blueprint: distances from the target are inverse to the quantity weights. Why it beats the long way: full weighted-average algebra is slower once the scale ratios are visible. Micro-example: Mix 10% and 40% to get 20%. Gaps 10 and 20 give ratio 1:2 strong to weak.
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