# IMO- Mathematics Olympiad Class 9: Questions 665 - 671 of 919

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## Question number: 665

MCQ▾

### Question

If 100 men can do a job in 80 days, in how many days will 120 men do it in ________.

### Choices

Choice (4) Response

a.

69 days

b.

67 days

c.

65 days

d.

63 days

## Question number: 666

MCQ▾

### Question

In the figure 3x = 90˚, then ∠ROS is________

### Choices

Choice (4) Response

a.

140˚

b.

130˚

c.

150˚

d.

120˚

## Question number: 667

MCQ▾

### Question

The compound interest on Rs. 80000 at per annum for 9 months, compound quarterly is ________

### Choices

Choice (4) Response

a.

Rs. 15610

b.

Rs. 12610

c.

Rs. 14610

d.

Rs. 13610

## Question number: 668

MCQ▾

If, then =

### Choices

Choice (4) Response

a.

1

b.

0

c.

3

d.

2

## Question number: 669

MCQ▾

### Question

A man rows downstream 30 km and upstream 18 km, taking 5 hours each time. The velocity of current is ________

### Choices

Choice (4) Response

a.

6 km/hr

b.

1.2 km/hr

c.

3.6 km/hr

d.

2.4 km/hr

## Question number: 670

MCQ▾

### Question

According to Euclid, a point has________

### Choices

Choice (4) Response

a.

No length, no breadth and no thickness

b.

No Length but breadth and thickness

c.

d.

Length and breadth but no thickness

## Question number: 671

MCQ▾

### Question

The number of values of k for which the system of equations , has the solutions?

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page