# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 373 - 379 of 968

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## Question 373

### Question

MCQ▾The mean of 11 observations is 30. If the mean of the first 6 observations is 40 and that of the last 6 observations is 44, then the Sixth observation is ________

### Choices

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

a. | 174 | |

b. | 131 | |

c. | 137 | |

d. | 128 |

## Question 374

### Question

MCQ▾The coordinates of the centre of a circle passing through is ________

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 375

### Question

MCQ▾Find the area of triangle if the coordinates of vertices are is ________

### Choices

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

a. | 2 sq. units. | |

b. | 5 sq. units | |

c. | 9 sq. units | |

d. | 3 sq. units |

## Question 376

### Question

MCQ▾Find the area of the quadrilateral, the coordinates of whose angular points taken in order are .

### Choices

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

a. | 8 | |

b. | 12 | |

c. | 10 | |

d. | 6 |

## Question 377

### Question

MCQ▾Find the area of triangle if the coordinates of vertices are is ________

### Choices

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

a. | 45.2 sq. units | |

b. | 20.5 sq. units. | |

c. | 19.3 sq. units | |

d. | 33.5 sq. units |

## Question 378

### Question

MCQ▾The mean weight of a class of 24 students is kg. if the weight of the teacher is included, the mean rises by 400 g. Then the weight of the teacher is ________

### Choices

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

a. | 65 kg | |

b. | 50 kg | |

c. | 55 kg | |

d. | 45 kg |

## Question 379

### Question

MCQ▾The average temperatures of Monday, Tuesday, Wednesday and Thursday was . The average temperature of Tuesday, Wednesday, Thursday and Friday was . If the temperature on Monday was , then the temperature on Friday was ________.

### Choices

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

a. | ||

b. | ||

c. | ||

d. |