# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 607 - 612 of 931

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## Question 607

### Question

MCQ▾

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 608

### Question

MCQ▾

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

### Choices

Choice (4)Response

a.

₹ 26

b.

₹ 60

c.

₹ 40

d.

₹ 36

## Question 609

### Question

MCQ▾

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 610

### Question

MCQ▾

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

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 611

### Question

MCQ▾

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

### Choices

Choice (4)Response

a.

b.

c.

d.

0

## Question 612

### Question

MCQ▾

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