# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 608 - 613 of 931

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## Question 608

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### Question

MCQ▾

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 609

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### 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

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### Question

MCQ▾

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

### Choices

Choice (4)Response
a.
b.
c.
d.

## Question 611

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### 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

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### 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

## Question 613

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### Question

MCQ▾

The mean of 13 observations is 14. If the mean of the first 7 observations is 12 and that of the last 7 observations is 16, then the 7th observation is ________

### Choices

Choice (4)Response
a.14
b.18
c.12
d.16