Direct and Inverse Proportions (IMO- Mathematics Olympiad 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 Equation 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

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