# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 822 - 827 of 931

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## Question 822

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### Question

MCQ▾

Tea worth Rs. 126 per kg and Rs. 135 per kg are mixed with a third variety in the ratio. If the mixture is worth Rs. 153 per kg, the price of the third variety per kg will be

### Choices

Choice (4)Response
a.Rs. 169.50
b.Rs. 180
c.Rs. 175.50
d.Rs. 170

## Question 823

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MCQ▾

Factors of

### Choices

Choice (4)Response
a.
b.
c.
d.

## Question 824

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### Question

MCQ▾

If 3 is added to the denominator of a fraction, the fraction becomes 6. If 4 is added to the numerator, the fraction becomes 30, the fraction is ________.

### Choices

Choice (4)Response
a.
b.
c.
d.

## Question 825

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### Question

MCQ▾

A box contains 8 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball? If 4 more black balls are put in the box, the probability of drawing a black ball is now double of what is was before, then x is________

### Choices

Choice (4)Response
a.6
b.3
c.9
d.2

## Question 826

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### Question

MCQ▾

The option which is not a solution of the equation , is________

### Choices

Choice (4)Response
a.(3,0)
b.(0,2)
c.(-3,4)
d.(1,1)

## Question 827

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### Question

MCQ▾

How many circles are there in the adjoining figure