# IMO- Mathematics Olympiad (SOF) Class 8: Questions 506 - 514 of 1029

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## Question number: 506

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

MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

130

b.

260

c.

210

d.

240

## Question number: 508

MCQ▾

### Question

If , then is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 509

MCQ▾

### Question

The value of when is________.

### Choices

Choice (4) Response

a.

4

b.

1

c.

2

d.

5

## Question number: 510

MCQ▾

### Question

The standard form of 0.003445 is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 511

MCQ▾

### Question

If and, then the value of is ________.

### Choices

Choice (4) Response

a.

15

b.

65

c.

85

d.

75

## Question number: 512

MCQ▾

### Question

The value of is ________.

### Choices

Choice (4) Response

a.

8044

b.

2044

c.

4450

d.

1024

## Question number: 513

MCQ▾

The value of

### Choices

Choice (4) Response

a.

15

b.

11

c.

17

d.

16

## Question number: 514

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

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