IMO- Mathematics Olympiad Class 9: Questions 607 - 612 of 919

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Question number: 607

» Analytical Reasoning and Logical Reasoning

MCQ▾

Question

If in the following groups of numbers after adding all the digits of each group, are arranged in decreasing order, then which will be middle group?

853, 395, 486, 249, 497, 766, 914

Choices

Choice (4) Response
a.

486

b.

395

c.

497

d.

766

Question number: 608

» Everyday Mathematics

MCQ▾

Question

A man rows downstream 40 50 km and upstream 20 30 km, taking 10 20 hours each time. The velocity of current is ________

Choices

Choice (4) Response
a.

3.5 km/hr

b.

1.5 km/hr

c.

2.5 km/hr

d.

0.5 km/hr

Question number: 609

» Statistics and Probability

MCQ▾

Question

The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of the girls is 30 kg. the number of boys and girls are________

Choices

Choice (4) Response
a.

20, 40

b.

30, 30

c.

35, 25

d.

25, 35

Question number: 610

» Statistics and Probability

MCQ▾

Question

A contractor employed 10 labourers at Rs. 60 each per day, 12 labourers at Rs. 40 each per day, 8 labourers at Rs. 20 each per day and 6 labourers at Rs. 10 each per day. The average wages paid is ________

Choices

Choice (4) Response
a.

Rs. 60

b.

Rs. 36

c.

Rs. 26

d.

Rs. 40

Question number: 611

» Statistics and Probability

MCQ▾

Question

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, find the n umber of blue balls in the bag.

Choices

Choice (4) Response
a.

15

b.

10

c.

5

d.

20

Question number: 612

» Polynomials

MCQ▾

Question

If x=2+3t , y=4t and z=1+5t, then value of x, y, z when 3xy+5z=77 , is________.

Choices

Choice (4) Response
a.

8,2,8

b.

8,2,11

c.

11,2,8

d.

2,11,8

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