# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 9): Questions 8 - 13 of 49

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## Question number: 8

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The bacteria in a culture grows by in the first hour, decreases by in the second hour and again increases by in the third hour. If at the end of the third hour the count of bacteria is 14000. The original count of bacteria in the sample is________

### Choices

Choice (4) Response

a.

19199

b.

20199

c.

17199

d.

18199

## Question number: 9

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The ratio of the ages of Mayuri and Mayur is 4: 3. The sum of their ages is 28 years. The ratio of their ages after 8 years will be:

### Choices

Choice (4) Response

a.

6: 5

b.

12: 17

c.

4: 7

d.

7: 4

## Question number: 10

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

In a family, the father took of the cake and he had 3 times as much as each of the other members had. The total number of family member is ________

### Choices

Choice (4) Response

a.

3

b.

10

c.

7

d.

12

## Question number: 11

» Mental Ability » Basic Arithmetic

MCQ▾

Only if

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 12

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

When simplified is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 13

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A car travels 120 km from A to B at 30 km per hour but returns the same distance at 40 km per hour. The average speed for the round trip is closest to

### Choices

Choice (4) Response

a.

36km/hr

b.

33 km/hr

c.

35km/hr

d.

34km/hr

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