# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 576 - 581 of 931

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## Question 576

## Question 577

### Question

MCQ▾A man purchases an blander whose printed price is Rs. 2200. If he received two successive discounts of and, he paid________

### Choices

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

a. | Rs. 1221 | |

b. | Rs. 1232 | |

c. | Rs. 1121 | |

d. | Rs. 1132 |

## Question 578

### Question

MCQ▾If , then values of x are________

### Choices

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

a. | x = 1 and x = 5 | |

b. | x = 5 and x=-1 | |

c. | x = 2 and x = 3 | |

d. | x=-1 and x=-3 |

## Question 579

### Question

MCQ▾Group the given figures into three classes using each figure only once.

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 580

### Question

MCQ▾In a class test, in English, 25 students scored 70 marks, 40 students scored 65 marks and 35 scored 50 marks. The mean of their score is (approximately) ________

### Choices

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

a. | 45 marks | |

b. | 29 marks | |

c. | 61 marks | |

d. | 65 marks |

## Question 581

### Question

MCQ▾The average of 20 numbers is calculated as 30. It is discovered later on that while calculating the average one number, namely 40 was wrongly read as 20. The correct average is________

### Choices

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

a. | 25 | |

b. | 28 | |

c. | 31 | |

d. | 26 |