# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 506 - 515 of 1042

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## Question 506

### Question

MCQ▾A can do a work in 3 days. If B is 25 % less efficient than A, then in how many days can B do the same work?

### Choices

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

a. | 3.5 | |

b. | 4 | |

c. | 5 | |

d. | 3 |

## Question 507

### Question

MCQ▾The ratio of boys and girls in a school of 910 students is . How many girls should be admitted to make ratio ?

### Choices

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

a. | 260 | |

b. | 240 | |

c. | 130 | |

d. | 210 |

## Question 508

## Question 509

### Question

MCQ▾The value of when is________.

### Choices

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

a. | 4 | |

b. | 5 | |

c. | 2 | |

d. | 1 |

## Question 510

### Question

MCQ▾The standard form of 0.003445 is________.

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 511

### Question

MCQ▾If and , then the value of is ________.

### Choices

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

a. | 75 | |

b. | 15 | |

c. | 85 | |

d. | 65 |

## Question 512

### Question

MCQ▾The value of is ________.

### Choices

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

a. | 8044 | |

b. | 1024 | |

c. | 4450 | |

d. | 2044 |

## Question 513

## Question 514

### Question

MCQ▾Two numbers are in the ratio 5: 7. If each number is increased by 14, the ratio becomes 7: 9. The numbers are________.

### Choices

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

a. | 35,25 | |

b. | 25,35 | |

c. | 35,49 | |

d. | 35,47 |

## Question 515

### Question

MCQ▾Number of prime factors in is

### Choices

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

a. | 72 | |

b. | 70 | |

c. | 55 | |

d. | 73 |