# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 818 - 823 of 1042

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## Question 818

### Question

MCQ▾

At what rate percent per annum will a sum of money double in 10 years?

### Choices

Choice (4)Response

a.

5 %

b.

20 %

c.

10 %

d.

15 %

## Question 819

### Question

MCQ▾

The ratio of two numbers is 1: 2. Which of the following ratio is equivalent to 1: 2?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 820

### Question

MCQ▾

A rectangular sheet of paper 30 cm X 18cm can be transformed into a right circular cylinder in two ways - by rolling the paper along its length or by rolling it along its breadth. Find the ratio of the volume of two cylinders formed.

### Choices

Choice (4)Response

a.

5: 3

b.

1: 5

c.

4: 3

d.

3: 2

## Question 821

### Question

MCQ▾

A ladder is leaning against a house. The distance from the top of the ladder to the ground is 12 feet, and the distance from the foot of the ladder to the house is 4 feet. How tall is the ladder?

### Choices

Choice (4)Response

a.

13 feet

b.

12.65 feet

c.

12 feet

d.

None of the above

## Question 822

### Question

MCQ▾

Roshni՚s age after 15 years will be 5 times his age 5 years back. What is the present age of Roshni?

### Choices

Choice (4)Response

a.

25 years

b.

10 years

c.

20 years

d.

30 years

## Question 823

### Question

MCQ▾

The average age of 2 boys is 14 years and their ages are in proportion 2: 5, the age of youngest girl is________.

### Choices

Choice (4)Response

a.

8 years

b.

9 years

c.

10 years

d.

4 years