# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 581 - 587 of 1042

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## Question 581

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### Question

MCQ▾

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 582

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### Question

MCQ▾

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 583

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### Question

MCQ▾

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 584

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### Question

MCQ▾

If , then the value of is________.

### Choices

Choice (4)Response
a.35
b.31
c.36
d.39

## Question 585

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### Question

MCQ▾

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 586

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### Question

MCQ▾

The value of is________.

### Choices

Choice (4)Response
a.675
b.690
c.630
d.655

## Question 587

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### Question

MCQ▾

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