# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 663 - 670 of 931

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## Question 663

### Question

MCQ▾If 100 men can do a job in 80 days, in how many days will 120 men do it in ________.

### Choices

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

a. | 67 days | |

b. | 65 days | |

c. | 63 days | |

d. | 69 days |

## Question 664

### Question

MCQ▾In the figure 3x = 90˚, then ∠ ROS is________

### Choices

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

a. | 120˚ | |

b. | 150˚ | |

c. | 130˚ | |

d. | 140˚ |

## Question 665

### Question

MCQ▾The compound interest on ₹ 80000 at per annum for 9 months, compound quarterly is ________

### Choices

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

a. | ₹ 14610 | |

b. | ₹ 12610 | |

c. | ₹ 15610 | |

d. | ₹ 13610 |

## Question 666

## Question 667

### Question

MCQ▾A man rows downstream 30 km and upstream 18 km, taking 5 hours each time. The velocity of current is ________

### Choices

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

a. | 1.2 km/hr | |

b. | 6 km/hr | |

c. | 3.6 km/hr | |

d. | 2.4 km/hr |

## Question 668

### Question

MCQ▾According to Euclid, a point has________

### Choices

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

a. | Length, breadth and thickness | |

b. | No Length but breadth and thickness | |

c. | Length and breadth but no thickness | |

d. | No length, no breadth and no thickness |

## Question 669

### Question

MCQ▾The number of values of k for which the system of equations , has the solutions?

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 670

### Question

MCQ▾Which of the following pairs of equations have the same solution

### Choices

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

a. | ||

b. | ||

c. | ||

d. |