Foundation
USE WHEN
Group sizes and/or group averages differ by percentages.
BEST METHOD
Alligation Method
TARGET
90–120 sec
MASTERY
not started
Group sizes and/or group averages differ by percentages.
Use weighted averages after translating percentage relations into multipliers.
Alligation can solve reverse group-ratio questions faster.
For reverse-average cases, use alligation instead of the full weighted-average equation.
Timed drill
Identify the base or invariant before you calculate.
Attempt first · Standard Example
Attempt first · CAT-Level Example
3-level practice ladder
Foundation
CAT Standard
Advanced / Hybrid
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