8th selected WBCS math question set for Arithmetic practice
10 WBCS math questions with answers are on fractions, percentage, ratio, number system, compound growth, simple interest, pipes cisterns, profit loss. 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
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
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 Calendar problems
8th WBCS arithmetic practice question set: time to answer: 10 mins
Problem 1
Fraction equivalent of $\displaystyle\frac{2}{3}$% of $\displaystyle\frac{5}{8}$% is,
- $\displaystyle\frac{5}{12}$
- $\displaystyle\frac{1}{240}$
- $\displaystyle\frac{1}{24000}$
- $\displaystyle\frac{4}{37500}$
Problem 2
$\displaystyle\frac{4}{5}$th of a number is 64. 70% of the number is,
- 44.8
- 70
- 42
- 56
Problem 3
If $\displaystyle\frac{1}{5}:\displaystyle\frac{1}{x}::\displaystyle\frac{1}{x}:\displaystyle\frac{1}{1.25}$, then $x$ is,
- 2.5
- 1.5
- 2
- 3.5
Problem 4
What number should come next in the sequence, 4, 5, 7, 10, 11, 13, 16,...
- 21
- 19
- 18
- 17
Problem 5
The perfect square number of least value divisible by 3, 4, 5, 6, and 8 is,
- 900
- 3600
- 1600
- 1200
Problem 6
A tree increases annually by $\displaystyle\frac{1}{8}$th of its height. What will be its height after 2 years if it stands today 64 ft high?
- 72 ft
- 74 ft
- 81 ft
- 80 ft
Problem 7
In a school, the ratio of boys and girls is $4:5$. When 100 girls leave the school, the ratio becomes, $6:7$. How many boys are there in the school?
- 1200
- 1300
- 1600
- 1500
Problem 8
A commission agent allows a rebate of 2% to an investor while the company pays an interest of 15% on the investment. What rate of interest does the investor actually earn on his investment?
- $17$%
- $16\displaystyle\frac{3}{8}$%
- $15$%
- $15\displaystyle\frac{15}{49}$%
Problem 9
In what proportion must water be added to spirit to gain 20% by selling it at cost price?
- $1:5$
- $2:3$
- $4:5$
- $3:5$
Problem 10
A water tank can be filled up by two pumps in 20 minutes and 30 minutes respectively. They were started together but due to some technical fault, the first pump stopped after some time and the second pump worked alone for the last 10 minutes. How long did they work together?
- 4 minutes
- 8 minutes
- 10 minutes
- 6 minutes
To know how to solve the problems quickly in mind and detailed explanation, you should refer to the corresponding solution set, Solution to 8th WBCS arithmetic practice set.
Answers to the questions
Problem 1. Answer: Option c: $\displaystyle\frac{1}{24000}$.
Problem 2. Answer: Option d: 56.
Problem 3. Answer: Option a: 2.5.
Problem 4. Answer: Option d: 17.
Problem 5. Answer: Option b: 3600.
Problem 6. Answer: Option c: 81 ft.
Problem 7. Answer: Option a: 1200.
Problem 8. Answer: Option d: $15\displaystyle\frac{15}{49}$%.
Problem 9. Answer: Option a: $1:5$.
Problem 10. Answer: Option b: 8 minutes.
Question and Solution sets on WBCS Arithmetic
10 WBCS Math Questions - 12th Solved Arithmetic Practice Set
Solution to 11th WBCS Math Question set for Arithmetic Practice
11th WBCS Math Question set for Arithmetic Practice
Solution to 10th WBCS Math Question set for Arithmetic Practice
10th WBCS Math Question set for Arithmetic Practice
Solution to 9th WBCS Math Question set for Arithmetic Practice
9th WBCS Math Question set for Arithmetic Practice
Solution to 8th WBCS Math Question set for Arithmetic Practice
8th WBCS Math Question set for Arithmetic Practice
Solution to 7th WBCS Math Question set for Arithmetic Practice
7th WBCS Math Question set for Arithmetic Practice
Solution to 6th WBCS Math Question set for Arithmetic Practice
6th WBCS Math Question set for Arithmetic Practice
Solution to 5th WBCS Math Question set for Arithmetic Practice
5th WBCS Math Question set for Arithmetic Practice
Solution to 4th WBCS Math Question set for Arithmetic Practice
4th WBCS Math Question set for Arithmetic Practice
Solution to 3rd WBCS Math Question set for Arithmetic Practice
3rd WBCS Math Question set for Arithmetic Practice
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