IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 570 - 576 of 1040

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Question number: 570

» Direct and Inverse Proportions

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MCQ▾

Question

If 4 men take an hour to dig a ditch, how long should it take 10 men to dig a ditch of the same type?

Choices

Choice (4) Response

a.

23 min

b.

20 min

c.

30 min

d.

24 min

Question number: 571

» Exponents and Powers

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MCQ▾

Question

Number of prime factors in is

Choices

Choice (4) Response

a.

20

b.

22

c.

23

d.

28

Question number: 572

» Direct and Inverse Proportions

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MCQ▾

Question

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

Choices

Choice (4) Response

a.

24: 15

b.

12: 23

c.

15: 14

d.

25: 14

Question number: 573

» Exponents and Powers

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MCQ▾

Question

The value of when is________.

Choices

Choice (4) Response

a.

85

b.

84

c.

80

d.

81

Question number: 574

» Direct and Inverse Proportions

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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.

20 minutes

b.

10 minutes

c.

15 minutes

d.

25 minutes

Question number: 575

» Exponents and Powers

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MCQ▾

Question

Number of prime factors in is

Choices

Choice (4) Response

a.

60

b.

70

c.

66

d.

73

Question number: 576

» Direct and Inverse Proportions

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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.

5 minutes

b.

4 minutes

c.

5.5 minutes

d.

4.8 minutes