If one quantity decreases as the other increases, then they are said to be in inverse proportion.

Inverse is just another word for doing the opposite.

For example , if one quantity is halved the other is doubled.

Inverse proportion questions don't always appear that straightforward though.

Don't bury your head in the sand with this type of question. They are more straightforward than you think.

Four dogs take five hours to did a big hole.

How long would it take ten dogs to dig the same sized hole at the same rate?

4 dogs | Take 5 hours | |

1 dog | 5 x 4 | 20 hours |

10 dogs | 20 ÷10 | 2 hours |

It takes 5 bakers, 4 hours to bake 125 cakes.

How long would it take 8 bakers to make 200 cakes if they all work at the same rate?

5 Bakers | Take 4 hours | |

1 baker | 4 x 5 | 20 hours |

8 bakers | 20 ÷ 8 | 2.5 hours (for 125 cakes) |

1 cake | 2.5 ÷ 125 | 0.02 hours |

200 cakes | 0.02 x 100 | 4 hours |

Don't you think it is unfair that you always have to do that bit extra before you can get some cake?