# IMO- Mathematics Olympiad Class 9: Questions 846 - 851 of 919

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## Question number: 846

MCQ▾

### Question

The mean of 24 observations is 35. If the mean of the first 12 observations is 31 and that of the last 12 observations is 38, then the 12th observation is ________

### Choices

Choice (4) Response

a.

14

b.

15

c.

11

d.

12

## Question number: 847

MCQ▾

### Question

Choose the correct alternative that will continue the same pattern. 6, 11, 21, 36, 56, (…. . )

### Choices

Choice (4) Response

a.

51

b.

81

c.

91

d.

42

## Question number: 848

MCQ▾

### Question

Which equation satisfies the data in the table?

 X 3 5 7 9 Y 2 4 6 8

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 849

MCQ▾

Factors of

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 850

MCQ▾

### Question

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.

60.67, 75, 65

b.

70.67, 77, 68

c.

70.67, 75, 68

d.

55.26, 78, 65

## Question number: 851

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. 250, Rs. 400

b.

Rs. 225, Rs. 425

c.

Rs. 300, Rs. 350

d.

Rs. 275, Rs. 375

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