# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 578 - 583 of 929

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## Question number: 578

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MCQ▾

### Question

If , then values of x are________

### Choices

Choice (4) Response

a.

x = 1 and x = 5

b.

x = 5 and x=-1

c.

x = 2 and x = 3

d.

x=-1 and x=-3

## Question number: 579

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MCQ▾

### Question

Group the given figures into three classes using each figure only once. The Different Shape Available in this Image and Find the Group Given the different shape available in this image find the group the given figures into three classes of 9 images

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 580

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MCQ▾

### Question

In a class test, in English, 25 students scored 70 marks, 40 students scored 65 marks and 35 scored 50 marks. The mean of their score is (approximately) ________

### Choices

Choice (4) Response

a.

45 marks

b.

29 marks

c.

61 marks

d.

65 marks

## Question number: 581

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MCQ▾

### Question

The average of 20 numbers is calculated as 30. It is discovered later on that while calculating the average one number, namely 40 was wrongly read as 20. The correct average is________

### Choices

Choice (4) Response

a.

25

b.

28

c.

31

d.

26

## Question number: 582

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MCQ▾

### Question

The solution of the equation and is________

### Choices

Choice (4) Response

a.

x = 4, y = 1

b.

x = 6, y = 1

c.

x = 5, y = 2

d.

x = 6, y = 2

## Question number: 583

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MCQ▾

### Question

If the positions of the third and tenth letters of the word DOCUMENTATION are interchanged, and likewise the positions of the fourth and seventh letters, the second and sixth letters are also interchanged, then which of the following will be eleventh letter from the right end?

### Choices

Choice (4) Response

a.

I

b.

N

c.

T

d.

U