# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 848 - 853 of 931

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## Question 848

### Question

MCQ▾

In a mathematics test given to 15 students, the following marks (out of 100) is recorded: 45, 56, 78, 54, 75, 34, 68, 98, 87, 99, 90, 76, 55,77, 68, then mean, median and mode of this data are respectively ________

### Choices

Choice (4)Response

a.

70.67,75, 68

b.

55.26,78, 65

c.

70.67,77, 68

d.

60.67,75, 65

## Question 849

### Question

MCQ▾

A man purchased two clocks A and B at a total cost ₹ 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.

₹ 275, ₹ 375

b.

₹ 300, ₹ 350

c.

₹ 250, ₹ 400

d.

₹ 225, ₹ 425

## Question 850

### Question

MCQ▾

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

### Choices

Choice (4)Response

a.

b.

0

c.

d.

## Question 851

### Question

MCQ▾

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 852

### Question

MCQ▾

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 853

### Question

MCQ▾

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