# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 837 - 841 of 1042

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## Question 837

### Question

MCQ▾The average age of 3 girls is 15 years and their ages are in proportion 3: 5: 7, the age of youngest girl is________.

### Choices

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

a. | 4 years | |

b. | 5 years | |

c. | 10 years | |

d. | 9 years |

## Question 838

### Question

MCQ▾Out of a number of electronics item. Ram purchases 60 % washing machines 2 % of these are found to be defective. The percentage of defective washing machine in all is________.

### Choices

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

a. | 5.5% | |

b. | 1.2% | |

c. | 3.5% | |

d. | 4.0% |

## Question 839

### Question

MCQ▾Tarun goes to a shop to buy a shirt costing Rs. 1000 including sales tax of 15%. He asks the shopkeeper to reduce the price of the watch so that he can save an amount equal to the sales tax. The reduction in the price of the sari is________.

### Choices

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

a. | Rs 150 | |

b. | Rs 250 | |

c. | Rs 120 | |

d. | None of the above |

## Question 840

Appeared in Year: *2012*

### Question

MCQ▾A person wants to reduce the trade tax so he calculates his profit on the sale price instead of on the cost price. In this way by selling an article for Rs. 280 he calculates his profit as what is the actual profit percentage?

### Choices

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

a. | 20.25% | |

b. | 14.86% | |

c. | 15.00% | |

d. | 16.66% |

## Question 841

### Question

MCQ▾A dog takes 4 leaps for every 5 leaps of a hare but 3 leaps of a dog are equal to 4 leaps of the hare. Compare their speeds.

### Choices

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

a. | 11: 12 | |

b. | 12: 13 | |

c. | 15: 16 | |

d. | All of the above |