# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 641 - 648 of 931

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## Question 641

### Question

MCQ▾The probability of guessing the correct answer to a certain test question is. If the probability of not guessing the correct answer to this question is , then x = ________

### Choices

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

a. | ||

b. | 4 | |

c. | 3 | |

d. |

### Passage

A car is going on a long journey for 16 hours, starting at 5.00 hrs. The speed of the car at different hours is given below:

Time (in hrs): | 5 | 7 | 9 | 11 | 13 | 17 | 15 | 19 | 21 |

Speed (in km/hour): | 40 | 50 | 60 | 80 | 70 | 65 | 75 | 60 | 50 |

From the above table answer the following questions.

## Question 642 (1 of 3 Based on Passage)

### Question

MCQ▾The average speed (in km/hour) between 5.00 hrs, 7.00 hrs and 9.00 hrs is ________

### Choices

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

a. | 60 | |

b. | 65 | |

c. | 52 | |

d. | 55 |

## Question 643 (2 of 3 Based on Passage)

### Question

MCQ▾The percentage of decrease in speed during 19.00 hrs and 21.00 hrs is ________

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 644 (3 of 3 Based on Passage)

### Question

MCQ▾The percentage of increase in speed during 9.00 hrs and 11.00 hrs is ________

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 645

### Question

MCQ▾Find the value of p if is a factor of the polynomial

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 646

### Question

MCQ▾At the end of the year 2002, Ram was half old as his grandpa. The sum of the years in which they were born is 3854. Age of Ram at the end of year 2003 is ________.

### Choices

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

a. | 50 | |

b. | 51 | |

c. | 35 | |

d. | 36 |

## Question 647

## Question 648

### Question

MCQ▾If 1 is added to the denominator of a fraction, the fraction becomes. If 1 is added to the numerator, the fraction becomes 1, the fraction is ________.

### Choices

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

a. | ||

b. | ||

c. | ||

d. |