April 13, 2023

Ratio

2. Sharing a quantity according to a ratio.

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April 13, 2023

To make a basic cake, you need to mix the ingredients in the ratio:

You need to bake an 800g cake.

2 parts butter2 parts sugar, and 1 part eggs.3 parts flour, 3 2 2 1

: : :

Add together all of the numbers in the ratio.

Divide the target weight by this total.

Multiply your answer by each number in the ratio.

++ +3 2 2 1= 8

800g ÷ 8 = 100g

3 × 100g = 300g flour2 × 100g = 200g sugar

2 × 100g = 200g butter1 × 100g = 100g eggs

Explanation

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April 13, 2023

A pond containing geese and ducks has 32 birds in total. There are more geese than ducks in a ratio of 5:3. How many ducks are there?

5 + 3 = 8 32 ÷ 8 = 4 4 × 3 = 12

There are 12 ducks in the pond.

Example

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April 13, 2023

This is a recipe for a fruit drink for six people.

300g chopped oranges1500ml lemonade750ml orange juiceHow much lemonade do you need to make enough drink for 9 people and for 10 people?

9 × 25ml =

10 × 25ml =

1500ml ÷ 6 = 25ml

You can quickly find the answers here, by dividing the quantity of lemonade used by 6, then multiplying your answer by the new target quantities.

225ml

250ml

Example

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