## 7th selected WBCS math question set for Arithmetic practice

**10** **WBCS math questions** with answers are on time* distance, race, number system, ratio, train running, time work, compound growth, componendo dividendo*. 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**

### 7th WBCS arithmetic practice question set: time to answer: 10 mins

#### Problem 1

A man gains 10% by selling an article at a certain price. If he sells it at double the price, the profit made is,

- 60%
- 20%
- 100%
- 120%

#### Problem 2

When 40% of a number is added to 42, the result is the number itself. The number is,

- 72
- 70
- 82
- 105

#### Problem 3

If $\displaystyle\frac{4}{5}$th of a cistern is filled in 1 minute, how much more time will be required to fill the rest of it?

- 10 sec
- 20 sec
- 12 sec
- 15 sec

#### Problem 4

If $a:b=c:d=e:f=1:2$, then $(3a+5c+7e):(3b+5d+7f)=\text{?}$.

- $1:2$
- $2:1$
- $1:4$
- $8:7$

#### Problem 5

The speed of a train 150m long is 50km/h. How much time will it take to pass a platform 600m long?

- 64 sec
- 60 sec
- 50 sec
- 54 sec

#### Problem 6

A can do a work in 20 days and B can do it in 12 days. B worked at it for 9 days. In how many days can A alone finish the remaining work?

- 3
- 5
- 7
- 11

#### Problem 7

If $(1^2 + 2^2 + 3^2+.....+10^2)=385$, then the value of $(2^2+4^2+6^2+.....+20^2)$ is,

- $770$
- $1155$
- $385\times{385}$
- $1540$

#### Problem 8

If $1.5x=0.04y$, then the value of $\left(\displaystyle\frac{y-x}{y+x}\right)$ is,

- $\displaystyle\frac{73}{77}$
- $\displaystyle\frac{703}{77}$
- $\displaystyle\frac{73}{770}$
- $\displaystyle\frac{730}{77}$

#### Problem 9

The population of a town increases annually by 5% . If it is 15435 now, the population two years ago was,

- 13700
- 14000
- 15000
- 14800

#### Problem 10

In a 100m race, A beats B by 10m and C by 13m. In a race of 180m between the three, B will beat C by,

- 6m
- 5m
- 5.4m
- 4.5m

To know how to solve the problems quickly in mind and detailed explanation, you should refer to the corresponding solution set, **Solution to 7th WBCS Math Question set for Arithmetic Practice.**

### Answers to the questions

**Problem 1.** Answer: Option d: 120%.

**Problem 2.** Answer: Option b: 70.

**Problem 3.** Answer: Option d: 15 secs.

**Problem 4.** Answer: Option a: $1:2$.

**Problem 5.** Answer: Option d: 54 secs.

**Problem 6.** Answer: Option b: 5 days.

**Problem 7.** Answer: Option d: 1540.

**Problem 8.** Answer: Option a: $\displaystyle\frac{73}{77}$.

**Problem 9.** Answer: Option b: 14000.

**Problem 10.** Answer: Option c: 5.4m.

### 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**