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Quantitative Ability Preparation for CDS

(27 Posts)

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This thread is dedicated to preparation for Quantitative Ability section of CDS. You may share questions related to topics like Algebra, Geometry and Measurement, Higher Mathematics, Statistics, Arithmetic etc.

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Ajay Kumar

Shared from CDS - 2017 (II) (Mathematics) on Oct 12, 2020 12:27 PM

An isosceles triangle is drawn outside, keeping one of the sides of a square as the base, in such a way that the perimeter of the complete figure is times the perimeter of the original square.

What is the ratio of the area of the triangle to the area of the original square?

1 : 1

2 : 3

1 : 2

1 : 3

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Ajay Kumar

How can you say that PD=DC? what if PC=DC since its an isosceles triangle.. any two sides can be equal

How can you say that PD=DC? what if PC=DC since its an isosceles triangle.. any two sides can be equal Please type your answer before submitting.

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Roopkaur

Posted on Oct 21, 2021 4:29 PM

We have not used PD = DC while we have used PD = PC & that is right.

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Ajay Kumar

Shared from CDS - 2017 (II) (Mathematics) on Oct 12, 2020 11:54 AM

If a train crosses a km-stone in 12 seconds, how long will it take to cross 91 km-stones completely if its speed is 60 km/hr?

1 hr 30 min

1 hr 30 min 12 sec

1 hr 51 min

1 hr 1 min 3 sec

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Ajay Kumar

Isn't it should be this way? speed of train = 50/3 m/s time = 12 sec distance = speed * time but the distance = length of train 1km stone i.e. l 1000 = 50/3 *12 which is not possible.. where am i wrong here? thanks in advance.

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Akshay

Posted on Sep 17, 2021 4:54 PM

Just simply find length of the train & then convert in km for feasibility to solve further.

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Saurav Khambayate

Shared from Mathematics Mock - 1 (CDS) on May 17, 2020 11:26 AM

Find the least number that should be subtracted from 1000 so that the remainder may be exactly divisible by 9, 12 and 18.

972

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Saurav Khambayate

Why 972 is subtracted from 1000

Why 972 is subtracted from 1000 Please type your answer before submitting.

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Akshay

Posted on Jul 01, 2020 1:24 PM

Already explained in solution.

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Raja

Shared from Mathematics Mock - 1 (CDS) on Nov 07, 2018 10:57 PM

When a natural number n is divided by 4, the remainder is 3. What is the remainder when 2n is divided by 4?

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Raja

Lets take n= 7 and is divided by 4, remainder is 3 2n = 14 and is divided by 4, remainder is 2

Lets take n= 7 and is divided by 4, remainder is 3 2n = 14 and is divided by 4, remainder is 2 Please type your answer before submitting.

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Prerna

Posted on Dec 24, 2018 10:43 AM

TCY has taken general values. There can be n number of possibilities.

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Suki

Shared from CDS - 2016 (II) (Mathematics) on Jan 30, 2018 5:55 AM

Two circles touch externally and sum of their areas is 130 cm² and the distance between their centres is 14 cm. What is the difference in the radii of the circles?

5 cm

6 cm

7 cm

8 cm

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Ayush Barthwal

Stupid tcy

Stupid tcy Please type your answer before submitting.

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Quantitative Ability Preparation for CDS

(27 Posts)

This thread is dedicated to preparation for Quantitative Ability section of CDS. You may share questions related to topics like Algebra, Geometry and Measurement, Higher Mathematics, Statistics, Arithmetic etc.