IMO- Mathematics Olympiad Class 9: Questions 683 - 687 of 919

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Question number: 683

» Statistics and Probability

MCQ▾

Question

The average of n numbers x1,x2,x3,.,xn is A. if x1 is replaced by (x+a)x1,x2 is replaced by (x+a)x2 , …, then the new average is ________

Choices

Choice (4) Response

a.

(x1)+nxnn

b.

(x+a)A

c.

nA+(n+1)xnn

d.

(n+1)A+xnn

Question number: 684

» Everyday Mathematics

MCQ▾

Question

One quality of wheat at Rs. 9.30 per kg is mixed with another quality at a certain rate in the ratio 8:7 . If the mixture so formed be worth Rs. 10 per kg, what is the rate per kg of the second quality of wheat?

Choices

Choice (4) Response

a.

Rs. 10.60

b.

Rs. 10.30

c.

Rs. 11

d.

Rs. 10.80

Question number: 685

» Everyday Mathematics

MCQ▾

Question

A bicycle is sold at a gain of 16% . If it had been sold for Rs. 20 more, 20% would have been gained. The C. P. of the bicycle is ________

Choices

Choice (4) Response

a.

Rs. 400

b.

Rs. 600

c.

Rs. 500

d.

Rs. 350

Question number: 686

» Everyday Mathematics

MCQ▾

Question

A certain number of men can finish a piece of work in 100 days. If there were 10 men less, it would take 10 days more for the work to be finished. How many men were there originally?

Choices

Choice (4) Response

a.

147

b.

146

c.

110

d.

75

Question number: 687

» Statistics and Probability

MCQ▾

Question

The King, queen and jack of clubs are removed from a deck of 52 cards and then well-shuffled. One card id selected from the remaining cards. The probability of getting a black card is ________

Choices

Choice (4) Response

a.

13

b.

12

c.

23

d.

32

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