# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 849 - 855 of 929

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## Question number: 849

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MCQ▾

### Question

A man purchased two clocks A and B at a total cost Rs. 650. He sells A at profit and B at a loss of and gets the same selling price for both the clocks. What are the purchasing prices of A and B respectively?

### Choices

Choice (4)Response

a.

Rs. 275, Rs. 375

b.

Rs. 300, Rs. 350

c.

Rs. 250, Rs. 400

d.

Rs. 225, Rs. 425

## Question number: 850

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MCQ▾

### Question

The sum of the x-coordinates of the intersection of and , is ________.

### Choices

Choice (4)Response

a.

b.

0

c.

d.

## Question number: 851

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MCQ▾

### Question

Average of 10 numbers is 12. What should be added as 11th number to make the average 13?

### Choices

Choice (4)Response

a.

28

b.

23

c.

30

d.

25

## Question number: 852

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MCQ▾

### Question

Mathematics is related to numbers in the same way as history is related to ________

### Choices

Choice (4)Response

a.

Dates

b.

Events

c.

Wars

d.

People

## Question number: 853

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MCQ▾

### Question

Age of Smith’s father is 4 times of his age. If 5 years ago, father’s age was 7 times of the age of his son at that time. What is Smith’s father present age?

### Choices

Choice (4)Response

a.

40 years

b.

60 years

c.

45 years

d.

51 years

## Question number: 854

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MCQ▾

### Question

If , then , is ________.

### Choices

Choice (4)Response

a.

2

b.

3

c.

0

d.

1

## Question number: 855

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MCQ▾

### Question

A and B invest in a business in the ratio . If of the total profit goes to charity and A’s share is Rs. 855, the total profit is ________

### Choices

Choice (4)Response

a.

Rs. 1500

b.

Rs. 1537.50

c.

Rs. 1425

d.

Rs. 1576

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