Direct and Inverse Proportions (IMO- Mathematics Olympiad Class 8): Questions 14 - 20 of 62

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Question number: 14

» Direct and Inverse Proportions

MCQ▾

Question

A can do a piece of work in 60 days. He works at it for 10 days and then B alone finishes the work in 42 days. The two together could have completed the work in ________.

Choices

Choice (4) Response
a.

22 days

b.

20 days

c.

30 days

d.

25 days

Question number: 15

» Direct and Inverse Proportions

MCQ▾

Question

For a group of 15 students food lasts for 50 days. For how many days will the same food last for 75 students?

Choices

Choice (4) Response
a.

15 days

b.

25 days

c.

10 days

d.

20 days

Question number: 16

» Direct and Inverse Proportions

MCQ▾

Question

If a:b=5:3 and 2:b=1:3 , then the value of a is ________.

Choices

Choice (4) Response
a.

8

b.

6

c.

9

d.

10

Question number: 17

» Direct and Inverse Proportions

MCQ▾

Question

The weight of a 12 m long iron rod is 20.5 kg. The weight of 5 m long of such rod will be________.

Choices

Choice (4) Response
a.

8 kg

b.

9 kg

c.

8.54 kg

d.

9.5 kg

Question number: 18

» Direct and Inverse Proportions

MCQ▾

Question

The weight of a 15 m long iron rod is 25 kg. The weight of 10 m long of such rod will be________.

Choices

Choice (4) Response
a.

18 kg

b.

16 kg

c.

16.6 kg

d.

18.54 kg

Question number: 19

» Direct and Inverse Proportions

MCQ▾

Question

A can do a work in 8 days. If B is 60 % more efficient than A, then in how many days can B do the same work?

Choices

Choice (4) Response
a.

3.5

b.

3

c.

5

d.

4

Question number: 20

» Direct and Inverse Proportions

MCQ▾

Question

A man completes 47 of a job in 10 days. At this rate how many more days will it take him to finish the job?

Choices

Choice (4) Response
a.

6

b.

7.5

c.

6.5

d.

7

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