IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 820 - 825 of 929

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Question number: 820

» Analytical Reasoning and Logical Reasoning

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Question

A group of 1200 persons consisting of captains and soldiers is travelling in a train. For every 15 soldiers there is one captain. The number of captains in the group is

Choices

Choice (4) Response

a.

80

b.

70

c.

75

d.

85

Question number: 821

» Statistics and Probability

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Question

In a class test, in mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 scored 40 marks and 3 scored 30 marks. The mean of their score is (approximately) ________

Choices

Choice (4) Response

a.

57 marks

b.

15 marks

c.

56 marks

d.

54 marks

Question number: 822

» Everyday Mathematics

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Question

Tea worth Rs. 126 per kg and Rs. 135 per kg are mixed with a third variety in the ratio . If the mixture is worth Rs. 153 per kg, the price of the third variety per kg will be

Choices

Choice (4) Response

a.

Rs. 169.50

b.

Rs. 180

c.

Rs. 175.50

d.

Rs. 170

Question number: 823

» Polynomials

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MCQ▾

Question

Factors of

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 824

» Everyday Mathematics

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MCQ▾

Question

If 3 is added to the denominator of a fraction, the fraction becomes 6. If 4 is added to the numerator, the fraction becomes 30, the fraction is ________.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 825

» Statistics and Probability

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Question

A box contains 8 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If 4 more black balls are put in the box, the probability of drawing a black ball is now double of what is was before, then x is________

Choices

Choice (4) Response

a.

6

b.

3

c.

9

d.

2