The Singing Hedgehog Guide
to:

Ratio and Proportion 6

Here is a harder example:

We start by cutting out the litres and writing the question as a ratio:

Again there is a blank row and we turn 1.19 into one,

then into the target number, 50.

So the answer is 840km.

next page

return to SHG main page

Ratio and Proportion 6

Here is a harder example:

A car travels 20km for each litre of petrol.

If one litre costs £1.19, how far will the car travel on £50 of petrol?

If one litre costs £1.19, how far will the car travel on £50 of petrol?

We start by cutting out the litres and writing the question as a ratio:

travel | : | cost | |

20km | : | £1.19 | |

: | |||

: | £50 |

Again there is a blank row and we turn 1.19 into one,

then into the target number, 50.

travel | : | cost | |

20km | : | £1.19 | |

20/1.19 | : | £1 | divide by 1.19 |

50x20/1.19 = 840km | : | £50 | times by 50 |

So the answer is 840km.

return to SHG main page