# IMO- Mathematics Olympiad Class 9: Questions 608 - 613 of 919

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## Question number: 608

MCQ▾

### Question

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.

3.5 km/hr

b.

1.5 km/hr

c.

2.5 km/hr

d.

0.5 km/hr

## Question number: 609

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.

20, 40

b.

30, 30

c.

35, 25

d.

25, 35

## Question number: 610

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. 60

b.

Rs. 36

c.

Rs. 26

d.

Rs. 40

## Question number: 611

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.

10

c.

5

d.

20

## Question number: 612

MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 613

MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

b.

c.

0

d.

f Page