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

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## Question 848

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### 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

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### Question

MCQ▾

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 850

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### 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

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### 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

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### 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

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### 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