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