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**Note**Course:
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Placement Preparation
**Specialization:
**Quantitative Aptitude**Offline Downloads:
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The Digi-notes (Ratio and Proportion) as presented here is prepared
strictly according to IBPS-PO, IBPS-Clerk, IBPS-SO and other PO/Clerk
level competitive exams. The main aim of the Digi-notes is to develop
the notion of the Ratio and Proportion so that candidate would be able
to handle the quantitative problems of the real world easily and
conveniently and hence in their competitive exams. Candidates are
advised to handle the Digi-notes by keeping in mind that they are going
to LEARN (NOT STUDY) the Ratio/Proportion so that you; yourself
would be able to minimize the steps required to conclude the answer of
the question and hence develop the SHORT TRICKS.
All the best…
Page 2 of 27

Contents
1.
2.
3.
4.
5.
6.
7.
Preface…………………………………………………………………………………..……2
Contents……………………………………………………………………………………..3
Introduction………………………………………………………………………………..4
What is Ratio?..…………………………………………………………………………..4
The Fundamental Property of Ratio….…………………………………………5
AnImportantResult……………………………………………………………………..5
Questions.…………………………………………………………………………………..5
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Introduction:
The Ratio could be perceived as a special case of percentage. All the
concept related to approaching the of the Ratio questions could be
easily correlated with the approach what we had already developed in
the percentage Digi-notes (Specially the application of the Unitary
Method). Like percentage; ratio is extensively used in the Data Analysis.
So you are advised to go through the chapter thoroughly keeping in
mind to learn how we are approaching the question.
What is Ratio?:
Page 4 of 27

Mathematically:
Let a and b be the two quantities.
Then ratio of a and b is defined as the fraction a b .
This fraction is simply denoted as a : b when we are talking
about the ratio.
And is is read as “a is to b”.
Practically:
Since with the help of the fractions we are making
comparison between the quantities, therefore ratio is the
comparison between two quantities.
The fundamental Property of Ratio:
As the multiplication or division by the same number to the
numerator and denominator doesn’t affect a faction; in the same
way the multiplication or division of each term of ratio by the
same non-zero number doesn’t affect the ratio.
An Important Result:
I st Ratio
A : B a : b
II Ratio B : C c : d
Then combined Ratio A : B : C ac : bc : bd
nd
It is to be noted that the individual ratios to be combined:
Should have one quantity in common.
And the common quantity of the Ist ratio should be at the
second place and that of the IInd ratio at the first place.
Questions:
Page 5 of 27

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