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

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## Question 822

### 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

## Question 824

### 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

### 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

### 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

### Question

MCQ▾How many circles are there in the adjoining figure

### Choices

Choice (4) | Response | |
---|---|---|

a. | 17 | |

b. | 14 | |

c. | 16 | |

d. | 15 |