# Direct and Inverse Proportions (IMO- Mathematics Olympiad Class 8): Questions 7 - 13 of 62

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## Question number: 7

» Direct and Inverse Proportions

### Question

The ratio of boys and girls in a school of 660 students is . How many girls should be admitted to make ratio ?

### Choices

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

a. | 50 | |

b. | 60 | |

c. | 40 | |

d. | 30 |

## Question number: 8

» Direct and Inverse Proportions

### Question

can do a piece of work in 50 days. He works at it for 5 days and then alone finishes the work in 30 days. The two together could have completed the work in ________.

### Choices

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

a. | 17.5 days | |

b. | 17 days | |

c. | 18 days | |

d. | 17.2 days |

## Question number: 9

» Direct and Inverse Proportions

### Question

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 | |

b. | 4 | |

c. | 5 | |

d. | 3.5 |

## Question number: 10

» Direct and Inverse Proportions

### Question

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. | 130 | |

b. | 260 | |

c. | 210 | |

d. | 240 |

## Question number: 11

» Direct and Inverse Proportions

### Question

If and , then the value of is ________.

### Choices

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

a. | 15 | |

b. | 65 | |

c. | 85 | |

d. | 75 |

## Question number: 12

» Direct and Inverse Proportions

### Question

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, 47 | |

b. | 25, 35 | |

c. | 35, 25 | |

d. | 35, 49 |

## Question number: 13

» Direct and Inverse Proportions

### Question

For a group of 20 students food lasts for 55 days. For how many days will the same food last for 50 students?

### Choices

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

a. | 12 days | |

b. | 11 days | |

c. | 22 days | |

d. | 21 days |