Direct and Inverse Proportions (IMO- Mathematics Olympiad Class 8): Questions 7 - 13 of 62

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Question number: 7

» Direct and Inverse Proportions

MCQ▾

Question

The ratio of boys and girls in a school of 660 students is 6:5 . How many girls should be admitted to make ratio 1:1 ?

Choices

Choice (4) Response
a.

50

b.

60

c.

40

d.

30

Question number: 8

» Direct and Inverse Proportions

MCQ▾

Question

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

Choices

Choice (4) Response
a.

17.5 days

b.

17 days

c.

18 days

d.

17.2 days

Question number: 9

» Direct and Inverse Proportions

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

b.

4

c.

5

d.

3.5

Question number: 10

» Direct and Inverse Proportions

MCQ▾

Question

The ratio of boys and girls in a school of 910 students is 8:5 . How many girls should be admitted to make ratio 1:1 ?

Choices

Choice (4) Response
a.

130

b.

260

c.

210

d.

240

Question number: 11

» Direct and Inverse Proportions

MCQ▾

Question

If x:y=1:5 and 3:x=1:5 , then the value of y is ________.

Choices

Choice (4) Response
a.

15

b.

65

c.

85

d.

75

Question number: 12

» Direct and Inverse Proportions

MCQ▾

Question

Two numbers are in the ratio 5: 7. If each number is increased by 14, the ratio becomes 7: 9. The numbers are________.

Choices

Choice (4) Response
a.

35, 47

b.

25, 35

c.

35, 25

d.

35, 49

Question number: 13

» Direct and Inverse Proportions

MCQ▾

Question

For a group of 20 students food lasts for 55 days. For how many days will the same food last for 50 students?

Choices

Choice (4) Response
a.

12 days

b.

11 days

c.

22 days

d.

21 days

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