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WBCS Math Question set for Arithmetic Practice 4

wbcs math questions arithmetic practice set 4

4th selected WBCS math question set for Arithmetic practice

10 WBCS math questions with answers are on boats rivers, number system, profit loss, fraction range, ratio, factorization, simplification by basic algebra.

It should be useful for prelims of other competitive exams also.

The solution set (linked at the end) explains how to solve the questions quickly in mind.

To refresh concepts on any topic and to know how to solve the questions quickly, refer to the concept articles listed below.

Or to skip the list and take the test straightaway, click here.

Concept tutorials and articles on Arithmetic

Number system, fractions and surds

Numbers, Number system and basic arithmetic operations

Factorization or finding out factors

HCF and LCM

Fractions and decimals, basic concepts part 1

How to solve surds part 1 rationalization

How to solve surds part 2 double square root surds and surd term factoring

How to find perfect square root of integers or decimals

Ratio and proportion and mixing liquids

Ratio and proportion

Arithmetic problems on mixing liquids and based ages

How to solve arithmetic mixture problems in a few steps 1

How to solve arithmetic mixture problems in a few steps 2

Percentage

Basic and rich percentage concepts

Componendo dividendo

Componendo dividendo explained

Simple interest and compound interest

Basic and rich concepts on simple interest and compound interest

Work time, work wages and pipes and cisterns

How to solve arithmetic problems on work time, work wages and pipes and cisterns

How to solve time work problems in simpler steps type 1

How to solve time work problems in simpler steps type 2

Speed time distance, train problems and boats in rivers

Basic concepts on speed time distance, train running and boats and rivers

How to solve time distance problems in a few simple steps 1

How to solve time distance problems in a few simple steps 2

Profit and loss

How to solve in a few steps profit and loss problems 1

How to solve similar problems in a few seconds profit and loss problems 2

How to solve difficult profit and loss problems in a few steps 3

How to solve difficult profit and loss problems in a few steps 4

Clocks and Calendars

How to solve Clock problems

How to solve Calendar problems


4th WBCS arithmetic practice question set: time to answer: 10 mins

Problem 1

In a river a man takes 3 hrs in rowing 3kms upstream, but rowing downstream he covers 15kms in same 3 hrs. The speed of the river current is,

  1. 2km/hr
  2. 4km/hr
  3. 9km/hr
  4. 6km/hr

Problem 2

The product of two successive positive integers is 1980. The smaller of the number is,

  1. 34
  2. 44
  3. 45
  4. 35

Problem 3

A shop owner gains the selling price of 20 chairs by selling 100 chairs. What is his gain percent?

  1. 15%
  2. 12%
  3. 25%
  4. 20%

Problem 4

The rational numbers lying between $\displaystyle\frac{1}{4}$ and $\displaystyle\frac{3}{4}$ are,

  1. $\displaystyle\frac{262}{1000}$, $\displaystyle\frac{752}{1000}$
  2. $\displaystyle\frac{9}{40}$, $\displaystyle\frac{31}{41}$
  3. $\displaystyle\frac{13}{50}$, $\displaystyle\frac{264}{350}$
  4. $\displaystyle\frac{63}{250}$, $\displaystyle\frac{187}{250}$

Problem 5

The ratio of two numbers is 5 : 8 and their difference is 69. The numbers are,

  1. 69, 128
  2. 115, 184
  3. 128, 197
  4. 43, 112

Problem 6

By what least number must 21600 be multiplied to make it a perfect cube?

  1. 10
  2. 30
  3. 6
  4. 60

Problem 7

The value of $\left[\left\{\left(-\displaystyle\frac{1}{2}\right)^2\right\}^{-2}\right]^{-1}$ is,

  1. $\displaystyle\frac{1}{4}$
  2. $\displaystyle\frac{1}{16}$
  3. $4$
  4. $16$

Problem 8

Each side of a rhombus is 5cm. Its area is,

  1. 23 cm sq
  2. 24 cm sq
  3. 25 cm sq
  4. data insufficient

Problem 9

If $A:B=\displaystyle\frac{1}{6}  :  \displaystyle\frac{1}{5}$, $B:C=\displaystyle\frac{1}{4}  :  \displaystyle\frac{1}{3}$, and $C:D=\displaystyle\frac{1}{3}  :  \displaystyle\frac{1}{5}$, then $A:D$ is,

  1. $\displaystyle\frac{1}{24}  :  \displaystyle\frac{1}{25}$
  2. $\displaystyle\frac{1}{25}  :  \displaystyle\frac{1}{29}$
  3. $\displaystyle\frac{1}{24}  :  \displaystyle\frac{1}{29}$
  4. $\displaystyle\frac{1}{27}  :  \displaystyle\frac{1}{25}$

Problem 10

3 men or 5 women can do a work in 12 days. In how many days will 6 men and 5 women will take to complete the work?

  1. 4 days
  2. 15 days
  3. 20 days
  4. 10 days

Related detailed solution set

Refer to the companion Solution to WBCS Math Question set for Arithmetic Practice 4 for detailed explanation of the concepts and quick methods of solution.


Answers to the questions

Problem 1. Answer: Option a: 2km/hr.

Problem 2. Answer: Option b: 44.

Problem 3. Answer: Option c: 25%.

Problem 4. Answer: Option d: $\displaystyle\frac{63}{250}$, $\displaystyle\frac{187}{250}$.

Problem 5. Answer: Option b: 115, 184.

Problem 6. Answer: Option a: 10.

Problem 7. Answer: Option: b: $\displaystyle\frac{1}{16}$.

Problem 8. Answer: Option d: data insufficient.

Problem 9. Answer: Option a: $\displaystyle\frac{1}{24}  :  \displaystyle\frac{1}{25}$.

Problem 10. Answer: Option: a: 4 days.


Question and Solution sets on WBCS Arithmetic

10 WBCS Math Questions - 12th Solved Arithmetic Practice Set

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11th WBCS Math Question set for Arithmetic Practice

Solution to 10th WBCS Math Question set for Arithmetic Practice

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Solution to 2nd WBCS Math Question set for Arithmetic Practice

2nd WBCS Math Question set for Arithmetic Practice

WBCS Main level Arithmetic Solution set 1

WBCS Main level Arithmetic Question set 1