Tricks on Mixture and Alligation for MP State Exams

By Nitin Singhal|Updated : February 22nd, 2021

Numerical ability section is considered to be one of the toughest subjects of State Exams. To make the chapter easy we are providing Basic Concepts and Tricks on Mixture and Alligation which will surely make the chapter easy for all of you.

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Mixture and Alligation

(i) To find the mean or average value of mixture when the prices of two or more ingredients which may be mixed together and the proportion in which they mixed are given.

(ii) To find the proportion in which the ingredients at given prices must be mixed to produce a mixture at a given price.

Note:

(1) The word Alligation literally means linking. The rule takes its name from the lines or links used in working out questions on the mixture.

(2) Alligation method is applied to the percentage value, ratio, rate, prices, speed etc and not for absolute values. That is, whenever per cent, per hour, per kg, per km etc, are being compared, we can use Alligation.

Rules of Alligation

if the gradients are mixed in a ratio, then

We represent it as under:

Then, (cheaper quantity) : (dearer quantity) = (d – m ) : (m – c)

Solved problems:

Ex1: In what proportion must rice at Rs3.10 per kg be mixed with rice at Rs3.60 per kg, so that the mixture be worth Rs3.25 a kg?

Solution:

By the alligation rule :

they must be mixed in the ratio 7 :3.

Milk and Water

Ex2: A mixture of certain quantity of milk with 16 liters of water is worth 90 P per liter. If pure milk be worth Rs1.08 per liter, how much milk is there in the mixture?

Solution:

The mean value is 90 P and price of water is 0 P.