Page 4 - Digi Notes : Maths - 11.03.2016

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The Alligation Rule

Introduction:

The word “Alligation” is used in the sense of mixing of two or

more ingredients. For example if we are mixing milk and

water; we could say it in other words that “We are having an

Alligation of milk and water”

The questions in which we observe the following two points;

we will conclude that the given question could be optimally

solved with the help of the Alligation Rule:

1. The Necessary Condition: A SENSE OF MIXING should be

conveyed from the question. The sense of mixing could

be either real mixing or hypothetical mixing.

2. The Sufficient Condition: The Relative Quantity of the

ingredients should be defined directly or indirectly in the

question as Alligation Rule is always applied on Relative

Quantity (per kg; per litre; percentage; ratio; average

etc); never on Absolute Quantity (Rs.; kg; litre; 100 etc).

Note (Very important): After applying the Alligation Rule; the

ratio obtained are always of the quantity which comes after
“per” i.e.; the quantity from which the division is done or

from which the comparison is made.

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