# Direct and Inverse Proportions (IMO- Mathematics Olympiad (SOF) Class 8): Questions 42 - 47 of 62

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## Question number: 42

» Direct and Inverse Proportions

MCQ▾

### Question

If A: B = 3: 4 and B: C = 5: 6, then C: A is equal to, ________.

### Choices

Choice (4) Response

a.

15: 14

b.

24: 15

c.

12: 23

d.

25: 14

## Question number: 43

» Direct and Inverse Proportions

MCQ▾

### Question

A cistern has two inlets A and B which can fill it in 10 minutes and 20 minutes respectively. An outlet C can empty the full cistern in 4 minutes. If all the pipes are opened together in the empty tank, time taken to fill the tank completely is ________.

### Choices

Choice (4) Response

a.

25 minutes

b.

20 minutes

c.

15 minutes

d.

10 minutes

## Question number: 44

» Direct and Inverse Proportions

MCQ▾

### Question

A water tank is two-fifth full. Pipe A can fill a tank in 12 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

### Choices

Choice (4) Response

a.

4.8 minutes

b.

5 minutes

c.

4 minutes

d.

5.5 minutes

## Question number: 45

» Direct and Inverse Proportions

MCQ▾

### Question

A man completes of a job in 12 days. At this rate how many more days will it take him to finish the job?

### Choices

Choice (4) Response

a.

27

b.

26

c.

24

d.

23

## Question number: 46

» Direct and Inverse Proportions

MCQ▾

### Question

can do a piece of work in 20 days and can do alone it in 10 days. B works at it for 5 days and then leaves. alone can finish the remaining work in________.

### Choices

Choice (4) Response

a.

11 days

b.

10 days

c.

10.5 days

d.

5 days

## Question number: 47

» Direct and Inverse Proportions

MCQ▾

### Question

Two numbers are in the ratio 7: 9. If each number is increased by 18, the ratio becomes 9: 11. The numbers are________.

### Choices

Choice (4) Response

a.

35,81

b.

63,85

c.

65,35

d.

63,81

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