Day 266: CDS Maths

5 questions (6 parts). Try each one first, then open its answer.

Question 1
Sets. Asked once: CDS 2 2017
31 $Which one of the following is a correct statement ?$
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Question 2
Simple and Compound Interest. Asked once: CDS 2 2018
26 $What is the principal amount which earns Rs. 210 as compound interest for the second year at 5% per annum ?$
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Question 3 (case study, 2 parts)
Statistics. Asked once: CDS 1 2019
Directions for the following two (02) items : Read the following frequency distribution for two series of observations and answer the two items that follow :
Class interval Frequency Series-I Frequency Series-II
10-20 20 4
20-30 15 8
30-40 10 4
40-50 $x$ $2x$
50-60 $y$ $y$
Total 100 100
1 $What is the mean of frequency distribution of Series-I ?$
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2 $What is the mode of the frequency distribution of Series-II ?$
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Question 4
Surds, Indices and Simplification. Asked once: CDS 1 2022
13 $43^x \times 47^y = (2021)^2$
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Question 5
Time, Speed and Distance. Asked once: CDS 2 2021
44 $A person rode one-third of a journey at 60 km/hr, one-third at 50 km/hr and the rest at 40 km/hr. Had the person ridden half of the journey at 60 km/hr and the rest at 40 km/hr, he would have taken 4 minutes longer to complete the journey. What distance did the person ride ?$
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Question 1