2.2.1 Try some yourself
A recipe for four people calls for teaspoon of mustard powder. How much should you use for ten people?
For one person you need teaspoons.
For ten people you need teaspoons.
So almost 2 teaspoons of mustard are needed.
The length of time it takes to cook a Christmas pudding in a pressure cooker depends on the weight of the pudding. Kim has forgotten the time per pound but remembers that her kg pudding takes 5 hours.
How long will it take to cook a 2 kg pudding?
If it takes 5 hours to cook kg then the time to cook 1 kg is 5 ÷ hours.
So a 2 kg pudding takes hours (6 hours 40 mins), assuming that cooking time is proportional to weight.