# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 502 - 507 of 968

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## Question 502

### Question

MCQ▾

The mean of 10 observations is . By error, one observation was noted as was misread as 24. Then the correct mean is ________

### Choices

Choice (4)Response

a.

23

b.

21

c.

25

d.

27

## Question 503

### Question

MCQ▾

The distance between the points and is ________

### Choices

Choice (4)Response

a.

2a

b.

3a

c.

a

d.

5a

## Question 504

### Question

MCQ▾

A drawer contains 8 red socks, 12 white socks and 10 blue socks. Without looking you draw out a sock and then draw out a second sock without returning the first sock. What is the probability that the first sock and second sock are both white?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 505

### Question

MCQ▾

If 2 man or 3 women or 4 boys can do a piece of work in 60 days, then the same piece of work will be done by 1 man, 1 woman and 1 boy in ________

### Choices

Choice (4)Response

a.

50 days

b.

49 days

c.

52 days

d.

51 days

## Question 506

### Question

MCQ▾

Six bells commence tolling together and toll at intervals of 2, 4, 6,8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?

### Choices

Choice (4)Response

a.

15

b.

16

c.

10

d.

4

## Question 507

### Question

MCQ▾

Ramesh travels a certain distance at 6 km/hr and reaches 20 min. late. If he travels at 8 km/hr, he reaches 20 min. earlier. The distance he has to travel is ________

### Choices

Choice (4)Response

a.

8 km

b.

5 km

c.

6 km

d.

7 km