# Mental Ability (NCO- Cyber Olympiad (SOF) Class 9): Questions 13 - 19 of 219

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## Question number: 13

» 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 9000. The original count of bacteria in the sample is________

### Choices

Choice (4) Response

a.

11458

b.

11286

c.

11784

d.

11956

## Question number: 14

» Mental Ability » Basic Algebra

MCQ▾

### Question

The solution of the equations is

### Choices

Choice (4) Response

a.

There is no solution

b.

c.

d.

## Question number: 15

» Mental Ability » Basic Algebra

MCQ▾

### Question

When simplified and expressed with negative exponents, the expression is equal to

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 16

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A bike travels 70 km from Rajkot to Jamnagar at 14 km per hour but returns the same distance at 15 km per hour. The average speed for the round trip is closest to

### Choices

Choice (4) Response

a.

13 km/hr

b.

10km/hr

c.

12km/hr

d.

16km/hr

## Question number: 17

» Mental Ability » Basic Algebra

MCQ▾

, then equals

### Choices

Choice (4) Response

a.

18

b.

c.

d.

## Question number: 18

» Mental Ability » Basic Arithmetic

MCQ▾

Only if

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 19

» 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

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