# IMO- Mathematics Olympiad Class 8: Questions 503 - 510 of 1029

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## Question number: 503

MCQ▾

### Question

can do a piece of work in 50 days. He works at it for 5 days and then 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

MCQ▾

### Question

Number of prime factors in is

### Choices

Choice (4) Response

a.

3

b.

4

c.

2

d.

6

## Question number: 505

MCQ▾

### Question

If, then the value of is________.

### Choices

Choice (4) Response

a.

1

b.

3

c.

4

d.

2

## 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.

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