# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 477 - 481 of 931

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## Question 477

### Question

MCQ▾The mean weight of 80 students in a class is 60 kg. The mean weight of boys is 70 kg while that of the girls is 50 kg. the number of boys and girls are________

### Choices

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

a. | 10,30 | |

b. | 40,40 | |

c. | 35,75 | |

d. | 45,35 |

## Question 478

### Question

MCQ▾If ∠ A and ∠ B are complementary angles and m ∠ A is x˚, which equation can be used to find m ∠ B which is denoted by y?

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 479

### Question

MCQ▾A cloth merchant has announced rebate in prices. If one needs to have a rebate of ₹ 40, then how many shirts each costing ₹ 32, he should purchase?

### Choices

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

a. | 10 | |

b. | 6 | |

c. | 5 | |

d. | 7 |

## Question 480

### Question

MCQ▾By selling a Car for ₹ 70000, a shopkeeper gains . If the profit is reduced to , then the selling price will be ________

### Choices

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

a. | ₹ 85000 | |

b. | ₹ 75000 | |

c. | ₹ 55000 | |

d. | ₹ 90000 |

## Question 481

### Question

MCQ▾Choose the figure that is different from the rest?

### Choices

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

a. | ||

b. | ||

c. | ||

d. |