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

Solve 10 WBCS math questions set 7 in 10 mins. Verify results from answers. To solve the questions this quick you need to know how to solve in mind.

Questions 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.

Answers to the questions are at the end.

### WBCS math question set 7: 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 WBCS math questions Set 7

**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**

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**8th WBCS Math Question set for Arithmetic Practice**

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**7th WBCS Math Question set for Arithmetic Practice**

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**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**