## 9th selected set of WBCS maths questions for Arithmetic practice

Solve 10 mixed arithmetic WBCS maths questions in 10 mins. Questions include boats and streams concept, fractions, simple interest, mixture and more.

The **linked solution set** explains how to solve the questions quickly in mind.

Answers are at the end.

### WBCS maths questions set 9: time to answer 10 mins

#### Problem 1

What will be the value of $8^{0.28}\times{4^{0.08}}$?

- $1$
- $4^{0.36}$
- $2$
- $8^{0.36}$

#### Problem 2

The selling price of an article is $\displaystyle\frac{4}{3}$ times its cost price. The gain percentage is,

- $33\displaystyle\frac{1}{3}$%
- $25\displaystyle\frac{1}{4}$%
- $20\displaystyle\frac{1}{2}$%
- $20\displaystyle\frac{1}{3}$%

#### Problem 3

In a mixture of 60 litres, the ratio of milk and water is 2 : 1. If the ratio of milk and water is to be 1: 2, then the amount of water (in litres) to be added is,

- 20
- 30
- 40
- 60

#### Problem 4

If $\text{20% of a} = \text{30% of b} = \displaystyle\frac{1}{6} \text{of c}$, then $a:b:c$ is,

- $2:3:16$
- $3:2:16$
- $10:15:18$
- $15:10:18$

#### Problem 5

Which fraction comes next in the sequence,

$\displaystyle\frac{1}{2}$, $\displaystyle\frac{3}{4}$, $\displaystyle\frac{5}{8}$, $\displaystyle\frac{7}{16}$,..?

- $\displaystyle\frac{12}{35}$
- $\displaystyle\frac{9}{32}$
- $\displaystyle\frac{11}{34}$
- $\displaystyle\frac{10}{17}$

#### Problem 6

The simple interest on a sum for 5 years is two-fifth of the sum. The percentage interest rate per annum is then,

- $10$%
- $6$%
- $8$%
- $12\displaystyle\frac{1}{2}$%

#### Problem 7

A clock is started at noon. By 10 minutes past 5, the hour hand has turned through an angle of

- $155^0$
- $145^0$
- $150^0$
- $160^0$

#### Problem 8

The speed of a boat in still waters is 15 km/hr. It goes 30 km upstream and returns to the starting point downstream in 4 hrs 30 mins. The speed of current of the stream is,

- 8 km/hr
- 5 km/hr
- 10 km/hr
- 15 km/hrÂ

#### Problem 9

Which of the following fractions lies between $\displaystyle\frac{3}{5}$ and $\displaystyle\frac{2}{3}$?

- $\displaystyle\frac{1}{15}$
- $\displaystyle\frac{1}{3}$
- $\displaystyle\frac{2}{5}$
- $\displaystyle\frac{31}{50}$

#### Problem 10

How many digits are required for numbering the pages of a 300 page book ?

- 492
- 792
- 789
- 299

To know how to solve the problems quickly in mind and detailed explanation, you should refer to the corresponding solution set, **Solution to 9th WBCS Math Question set for Arithmetic Practice.**

### Answers to the WBCS maths questions set 9

**Problem 1.** Answer. Option c: $2$.

**Problem 2.** Answer: Option a: $33\displaystyle\frac{1}{3}$%.

**Problem 3.** Answer: Option d: 60.

**Problem 4.** Answer: Option d: $15:10:18$.

**Problem 5.** Answer: Option b: $\displaystyle\frac{9}{32}$.

**Problem 6.** Answer: Option c: $8$%.

**Problem 7.** Answer: Option a: $155^0$.

**Problem 8.** Answer: Option b: 5 km/hr.

**Problem 9.** Answer: Option d: $\displaystyle\frac{31}{50}$.

**Problem 10.** Answer: Option b: 792.

### Question and Solution sets on WBCS Arithmetic

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