# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 502 - 507 of 968

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## Question 502

### Question

MCQ▾The mean of 10 observations is . By error, one observation was noted as was misread as 24. Then the correct mean is ________

### Choices

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

a. | 23 | |

b. | 21 | |

c. | 25 | |

d. | 27 |

## Question 503

### Question

MCQ▾The distance between the points and is ________

### Choices

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

a. | 2a | |

b. | 3a | |

c. | a | |

d. | 5a |

## Question 504

### Question

MCQ▾A drawer contains 8 red socks, 12 white socks and 10 blue socks. Without looking you draw out a sock and then draw out a second sock without returning the first sock. What is the probability that the first sock and second sock are both white?

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 505

### Question

MCQ▾If 2 man or 3 women or 4 boys can do a piece of work in 60 days, then the same piece of work will be done by 1 man, 1 woman and 1 boy in ________

### Choices

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

a. | 50 days | |

b. | 49 days | |

c. | 52 days | |

d. | 51 days |

## Question 506

### Question

MCQ▾Six bells commence tolling together and toll at intervals of 2, 4, 6,8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?

### Choices

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

a. | 15 | |

b. | 16 | |

c. | 10 | |

d. | 4 |

## Question 507

### Question

MCQ▾Ramesh travels a certain distance at 6 km/hr and reaches 20 min. late. If he travels at 8 km/hr, he reaches 20 min. earlier. The distance he has to travel is ________

### Choices

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

a. | 8 km | |

b. | 5 km | |

c. | 6 km | |

d. | 7 km |