# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 581 - 587 of 1040

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## Question number: 581

Edit
MCQ▾

### Question

can do a piece of work in 20 days and can do alone it in 10 days. B works at it for 5 days and then leaves. alone can finish the remaining work in________.

### Choices

Choice (4)Response

a.

10 days

b.

10.5 days

c.

5 days

d.

11 days

## Question number: 582

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MCQ▾

### Question

Two numbers are in the ratio 7: 9. If each number is increased by 18, the ratio becomes 9: 11. The numbers are________.

### Choices

Choice (4)Response

a.

35,81

b.

63,81

c.

63,85

d.

65,35

## Question number: 583

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MCQ▾

### Question

A bag contains 50 paise, 25 paise and 10 paise coins in the ratio 1: 2: 3. If their total value is Rs. 26, the number of 50 paise coins is ________.

### Choices

Choice (4)Response

a.

50

b.

80

c.

30

d.

20

## Question number: 584

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MCQ▾

### Question

If , then the value of is________.

### Choices

Choice (4)Response

a.

35

b.

31

c.

36

d.

39

## Question number: 585

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MCQ▾

### Question

A sum of money is sufficient to pay wages for 15 days and wages for 20 days. The same money is sufficient to pay the wages of both for ________.

### Choices

Choice (4)Response

a.

8 days

b.

days

c.

days

d.

10 days

## Question number: 586

Edit
MCQ▾

### Question

The value of is________.

### Choices

Choice (4)Response

a.

675

b.

690

c.

630

d.

655

## Question number: 587

Edit
MCQ▾

### Question

If 5 men take an hour to dig a ditch, how long should it take 20 men to dig a ditch of the same type?

### Choices

Choice (4)Response

a.

13 min

b.

14 min

c.

21 min

d.

15 min

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