Proportion Notes

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Proportion

Direct proportion is when one variable increases e.g. more pizzas cost more money.

y is the cost

x is the number of pizzas

Inverse proportion is when one variable decreases as the other increases e.g. the time taken to paint a fence decreases if you have more people.

y is the time taken

x is the people painting the fence

Example

4 people have enough food to camp for 6 days. How long would the same food last 3 people

Working

4 x 6 = 24

24 ÷ 3 = 8

8 people