# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 506 - 515 of 1042

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## Question 506

### Question

MCQ▾

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.

3.5

b.

4

c.

5

d.

3

## Question 507

### Question

MCQ▾

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.

260

b.

240

c.

130

d.

210

## Question 508

### Question

MCQ▾

If , then is________.

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 509

### Question

MCQ▾

The value of when is________.

### Choices

Choice (4)Response

a.

4

b.

5

c.

2

d.

1

## Question 510

### Question

MCQ▾

The standard form of 0.003445 is________.

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 511

### Question

MCQ▾

If and , then the value of is ________.

### Choices

Choice (4)Response

a.

75

b.

15

c.

85

d.

65

## Question 512

### Question

MCQ▾

The value of is ________.

### Choices

Choice (4)Response

a.

8044

b.

1024

c.

4450

d.

2044

## Question 513

MCQ▾

The value of

### Choices

Choice (4)Response

a.

17

b.

11

c.

15

d.

16

## Question 514

### Question

MCQ▾

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.

35,25

b.

25,35

c.

35,49

d.

35,47

## Question 515

### Question

MCQ▾

Number of prime factors in is

### Choices

Choice (4)Response

a.

72

b.

70

c.

55

d.

73