# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 380 - 387 of 968

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## Question 380

### Question

MCQ▾If the centroid of the triangle formed by the points is at the origin, then

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## Question 381

### Question

MCQ▾The mean of ten numbers is 60. If one number is excluded, then their mean is 50, the excluded number is ________

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Choice (4) | Response | |
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a. | 130 | |

b. | 140 | |

c. | 150 | |

d. | 160 |

## Question 382

### Question

MCQ▾Find the area of the triangle whose vertices are and

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## Question 383

### Question

MCQ▾XYZ is an isosceles triangle. If the coordinates of the base are , then the coordinates of the vertex Z can be

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## Question 384

### Question

MCQ▾The mean of 7 observations is 20. If the mean of the first 4 observations is 20 and that of the last 4 observations is 16, then the Fourth observation is ________

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Choice (4) | Response | |
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a. | 7 | |

b. | 4 | |

c. | 8 | |

d. | 3 |

## Question 385

### Question

MCQ▾In the given figure And , then ________

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## Question 386

## Question 387

### Question

MCQ▾is three vertices of the parallelogram ABCD. The coordinates of fourth vertex is ________

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