WBCS Main Level Arithmetic Question Set 4

4th set of selected set of WBCS Main Arithmetic Questions for practice

Solve 10 arithmetic practice problems for WBCS Set 4 in 10 mins. Verify results from answers. Useful for any similar aptitude test on arithmetic.

Questions are on boats rivers, number system, profit loss, fraction range, ratio, factorization, simplification by basic algebra.

Answers to the questions and link to the quick solutions in mind are at the end.

WBCS Arithmetic practice problems set 4: 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

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Related detailed solution set

Refer to the companion WBCS Main level Arithmetic Solution Set 4 for detailed explanation of the concepts and quick methods of solution.

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Answers to the WBCS Arithmetic practice problems set 4

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.

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Question and Solution sets on WBCS Arithmetic

For all WBCS main arithmetic question sets click here.

For all WBCS main arithmetic solution sets click here.

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