# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 607 - 612 of 929

Access detailed explanations (illustrated with images and videos) to 929 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. Subscription can be renewed yearly absolutely FREE! View Sample Explanation or View Features.

Rs. 450.00 or

How to register?

## Question number: 607

Edit
MCQ▾

### Question

The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of the girls is 30 kg. the number of boys and girls are________

### Choices

Choice (4) Response

a.

35,25

b.

20,40

c.

25,35

d.

30,30

## Question number: 608

Edit
MCQ▾

### Question

A contractor employed 10 labourers at Rs. 60 each per day, 12 labourers at Rs. 40 each per day, 8 labourers at Rs. 20 each per day and 6 labourers at Rs. 10 each per day. The average wages paid is ________

### Choices

Choice (4) Response

a.

Rs. 26

b.

Rs. 60

c.

Rs. 40

d.

Rs. 36

## Question number: 609

Edit
MCQ▾

### Question

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, find the n umber of blue balls in the bag.

### Choices

Choice (4) Response

a.

15

b.

5

c.

10

d.

20

## Question number: 610

Edit
MCQ▾

### Question

If , and then value of x, y, z when , is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 611

Edit
MCQ▾

### Question

Two coins are tossed simultaneously. The probability of getting at least one head is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

0

## Question number: 612

Edit
MCQ▾

### Question

In a telephone directory which of the following names will appear in the third position

### Choices

Choice (4) Response

a.

Mahinder

b.

Mahender

c.

Mahendra

d.

Mahindra