IMO- Mathematics Olympiad Class 8: Questions 501 - 507 of 1029

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Question number: 501

» Exponents and Powers

MCQ▾

Question

The value of (1331)23 is ________.

Choices

Choice (4) Response

a.

1120

b.

1122

c.

1111

d.

1121

Question number: 502

» 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: 503

» 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: 504

» Exponents and Powers

MCQ▾

Question

Number of prime factors in (729)25×(4125)35×(605)15 is

Choices

Choice (4) Response

a.

3

b.

4

c.

2

d.

6

Question number: 505

» Exponents and Powers

MCQ▾

Question

If 872×7x2×7x2=42 , then the value of x is________.

Choices

Choice (4) Response

a.

1

b.

3

c.

4

d.

2

Question number: 506

» 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: 507

» 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

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