# Mental Ability (NCO- Cyber Olympiad Class 6): Questions 17 - 22 of 394

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## Question number: 17

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Find the prime number from given numbers.

### Choices

Choice (4) Response

a.

27

b.

69

c.

23

d.

39

## Question number: 18

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A basket contains 300 mangoes. 75 mangos were distributed among students. The percentage of mangoes left in the basket is ________.

### Choices

Choice (4) Response

a.

75%

b.

30%

c.

25%

d.

50%

## Question number: 19

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Harsh is learning mathematics, he has X number then he multiply the number by 7 and subtract 9 from the answer. Starting with X, how can he get his original number back?

### Choices

Choice (4) Response

a.

Divide X by 7 and then add 9 to the result

b.

Add 9 to X and then divide the resulting number by 7

c.

Subtract 9 from answer and then multiply the result by 7

d.

Multiply X by 9 and then subtract 7 from the result

## Question number: 20

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

HCF of two numbers is ________.

### Choices

Choice (4) Response

a.

The greatest number which divides each number exactly

b.

The greatest number exactly divisible by each number

c.

(The product of two numbers) their LCM

d.

Both a. and c. are correct

## Question number: 21

» Mental Ability » Ranking Test

MCQ▾

### Question

Which pair of numbers represents the greatest and the least numbers in the following set?

{0, 7, 2, 0.08, 1.69, 1.8}

### Choices

Choice (4) Response

a.

{1.69, 0.08}

b.

{2, 0.7}

c.

{2, 0.08}

d.

{1, 8, 2}

## Question number: 22

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Teachers were taking lectures. Each teacher’s lecture was 28 to 30 minutes long. Which of the following is the best estimate for the number of lectures that could be given in 3-hours?

### Choices

Choice (4) Response

a.

6 lectures

b.

3 lectures

c.

10 lectures

d.

9 lectures

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