## 10th selected WBCS math question set for Arithmetic practice

Practice on selected WBCS maths question set 10. Verify results from given answers. You may learn how to solve the questions quickly from linked solutions.

Questions are on *number system, hcf lcm, square root, simplification, ratio, fractions, series, compound interest, clock*.

The practice question set 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 maths question set 10 for arithmetic practice: time to answer 10 mins

#### Problem 1

a, b, c and d are four consecutive odd integers and their average is 42. What is the product of a and c?

- 1845
- 1890
- 1677
- 1860

#### Problem 2

The HCF and LCM of two numbers $x$ and $y$ are respectively 3 and 105. If value of $x+y=36$, then $\displaystyle\frac{1}{x}+\displaystyle\frac{1}{y}$ is,

- $\displaystyle\frac{3}{5}$
- $\displaystyle\frac{4}{35}$
- $\displaystyle\frac{1}{35}$
- $35$

#### Problem 3

A gardener plants 17956 trees in such a way that there are as many rows as there are trees in a row. The number of trees in a row are,

- 144
- 136
- 154
- 134

#### Problem 4

$\displaystyle\frac{(0.73)^3+(0.27)^3}{(0.73)^2+(0.27)^2-(0.73)\times{(0.27)}}$=?.

- $0.73$
- $1$
- $0.4087$
- $0.46$

#### Problem 5

The simplified value of $\displaystyle\frac{1}{1000}\left(\displaystyle\frac{1}{5}+999\displaystyle\frac{494}{495}\times{99}\right)$ is,

- 99
- 99900
- 990
- 9900

#### Problem 6

If $\displaystyle\frac{1}{25}:\displaystyle\frac{1}{x}::\displaystyle\frac{1}{x^2}:\displaystyle\frac{1}{78.125}$, then $x$ is,

- 1.5
- 12.5
- 2
- 3.5

#### Problem 7

The product of two co-primes is 117. Their LCM should be,

- 117
- 1
- equal to their HCF
- cannot be determined

#### Problem 8

Which pair of numbers should come next in the sequence, 9 12 11 14 13 16 15...?

- 18 21
- 18 17
- 17 18
- 14 13

#### Problem 9

The compound interest on Rs. 2000 for two years at 8% per annum is,

- Rs. 228.80
- Rs. 232.80
- Rs. 532.80
- Rs. 332.80

#### Problem 10

Reflex angle between the hands of a clock at 10.25 is,

- $180^0$
- $195^0$
- $192\displaystyle\frac{1}{2}^0$
- $197\displaystyle\frac{1}{2}^0$

To know how to solve the problems quickly in mind and detailed explanation, you should refer to the corresponding solution set, **Solution to 10th WBCS Math Question set for Arithmetic Practice.**

### Answers to the WBCS maths questions set 10 for arithmetic practice

**Problem 1.** Answer. Option c: 1677.

**Problem 2.** Answer: Option b: $\displaystyle\frac{4}{35}$.

**Problem 3.** Answer: Option d: 134.

**Problem 4.** Answer: Option b: $1$.

**Problem 5.** Answer: Option a: 99.

**Problem 6.** Answer: Option b: 12.5.

**Problem 7.** Answer: Option a: 117.

**Problem 8.** Answer: Option b: 18 17.

**Problem 9.** Answer: Option d: Rs. 332.80.

**Problem 10.** Answer: Option d: $197\displaystyle\frac{1}{2}^0$.

### Question and Solution sets on WBCS Arithmetic

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