# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 600 - 606 of 931

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## Question 600

### Question

MCQ▾

The mean weight of 120 students in a class is 100 kg. The mean weight of boys is 110 kg while that of the girls is 90 kg. The number of boys and girls are________

### Choices

Choice (4)Response

a.

10,50

b.

70,40

c.

40,30

d.

60,60

## Question 601

### Question

MCQ▾

The median of the observation 3, 5, 9, 5,4, 3,1 is ________

### Choices

Choice (4)Response

a.

1

b.

4

c.

5

d.

3

## Question 602

### Question

MCQ▾

In a km. race A beats B by 50 metres or 5 seconds. Then A՚s time over the course is ________

### Choices

Choice (4)Response

a.

3 minutes 17 seconds

b.

2 minutes 35 seconds

c.

1 minutes 35 seconds

d.

2 minutes 20 seconds

## Question 603

### Question

MCQ▾

If the mode of the following data 6, 8,7, 6, x, 6, 4, 8, 7,4, 8,7 is 6, then value of x is ________

### Choices

Choice (4)Response

a.

4

b.

8

c.

1

d.

6

## Question 604

MCQ▾

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 605

### Question

MCQ▾

If in the following groups of numbers after adding all the digits of each group, are arranged in decreasing order, then which will be middle group?

853, 395, 486, 249, 497,766, 914

### Choices

Choice (4)Response

a.

497

b.

395

c.

486

d.

766

## Question 606

### Question

MCQ▾

A man rows downstream 40 50 km and upstream 20 30 km, taking 10 20 hours each time. The velocity of current is ________

### Choices

Choice (4)Response

a.

2.5 km/hr

b.

3.5 km/hr

c.

0.5 km/hr

d.

1.5 km/hr