IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 498 - 506 of 1040

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Question number: 498

» Direct and Inverse Proportions

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MCQ▾

Question

A bag contains 25 paise, 10 paise and 5 paise coins in the ratio 2: 3: 4. If their total value is Rs. 20, the number of 5 paise coins is ________.

Choices

Choice (4)Response

a.

80

b.

70

c.

60

d.

50

Question number: 499

» Exponents and Powers

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MCQ▾

Question

If and , then is equal to________.

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 500

» Direct and Inverse Proportions

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MCQ▾

Question

Two numbers are in the ratio 1: 3. If each number is increased by 9, the ratio becomes 3: 5. The numbers are________.

Choices

Choice (4)Response

a.

4.5,13.5

b.

13,14

c.

3.5,14.7

d.

35,25

Question number: 501

» Exponents and Powers

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MCQ▾

Question

The value of is ________.

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 502

» Direct and Inverse Proportions

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MCQ▾

Question

The ratio of boys and girls in a school of 660 students is . How many girls should be admitted to make ratio ?

Choices

Choice (4)Response

a.

30

b.

50

c.

40

d.

60

Question number: 503

» Direct and Inverse Proportions

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MCQ▾

Question

can do a piece of work in 50 days. He works at it for 5 days and then alone finishes the work in 30 days. The two together could have completed the work in ________.

Choices

Choice (4)Response

a.

20 days

b.

17 days

c.

21 days

d.

18 days

Question number: 504

» Exponents and Powers

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MCQ▾

Question

Number of prime factors in is

Choices

Choice (4)Response

a.

4

b.

2

c.

6

d.

3

Question number: 505

» Exponents and Powers

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MCQ▾

Question

If, then the value of is________.

Choices

Choice (4)Response

a.

3

b.

1

c.

2

d.

4

Question number: 506

» Direct and Inverse Proportions

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MCQ▾

Question

A can do a work in 3 days. If B is 25 % less efficient than A, then in how many days can B do the same work?

Choices

Choice (4)Response

a.

3.5

b.

4

c.

5

d.

3

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