General Aptitude: Mixture and Allegation

By Asha Gupta|Updated : June 16th, 2021
















 Mixture & Alligation


Definition: When two or more types of liquids are mixed with each other in a vessel, we get what is called a “mixture”. Here the amount or quantities of two or more liquids is expressed in terms of respective ratios or percentage values.

For example, milk and water can be mixed to get a mixture. Mixtures can be identified by the name of liquids and their ratio.

Mixtures are of 3 types:

  1. Solid
  2. Liquid
  3. Gaseous

Depending upon the number of ingredients of Types of mixtures:

Simple Mixtures: When two or more different ingredients/solutions are mixed together.

Compound Mixtures: When two or more simple mixtures are mixed together. In mixture and solutions, we deal with 2 concepts:

  • Alligation
  • Replacement

Alligation: It is a method in which two or more solutions/ingredients are mixed in different ratios and the desired mixture is obtained or the desired mixture is given and the respective ratio in which the given solutions are mixed is asked in the question.

Note: The basic concept of Alligation lies in “weighted average”. If we mix 2 things, and the average of both are A1 and A2, and the quantities of both are n1 and n2. Then the average of the mixture is called as “weighted average”.

Important Formulas for Mixture and Alligation:

If two different articles priced at CP1 and CP2 with their quantities Q1, and Q2 then the Cost Price of the Mixture is calculated by the following Method:

Let a container contains “x” units of liquid from which “m” units of liquid are taken out and replaced by water or any other liquid. And this operation is repeated for “n” times. Thus, the quantity of remaining pure liquid after “n” operations:


Sahi Prep Hai Toh Life Set Hai!

Posted by:

Asha GuptaAsha GuptaMember since Mar 2021
Associate Content Developer - AE/JE Non-technical
Share this article   |


write a comment

Follow us for latest updates