PYQ Vault

One factor of a fixed product rises by r%: percent reduction needed in the other

This type of question, asked 4 times: CDS 2 2017, CDS 1 2018, CDS 1 2023, CDS 2 2024. All 4 questions below, oldest first.

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  1. Question 1

    CDS 2 2017

    44
    When prices rise by 12%, if the expenditure is to be the same, what is the percentage of consumption to be reduced ?

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  2. Question 2

    CDS 1 2018

    21
    If the price of wheat rises by 25%, then by how much percent must a man reduce his consumption in order to keep his budget the same as before?

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  3. Question 3

    CDS 1 2023

    66
    If the length of a rectangle is increased by 6623%66\frac{2}{3}\%, then by what percent should the width of the rectangle be decreased in order to maintain the same area ?

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  4. Question 4

    CDS 2 2024

    65
    A question is given followed by two statements I and II. Consider the Question and the Statements and mark the correct option. Question : If the price of petrol goes up by 20%, by what percentage should the consumption be reduced so that the expenditure remains the same ? Statement-I : Price of petrol per litre was Rs. 90 Statement-II : Consumption was 24 litre before price hike Which one of the following is correct in respect of the above Question and the Statements ?

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