Peggy Sue decided to enter her famous chili at her local chili cooking contest. Normally, she needs five tomatoes to make enough chili for her family of seven famous recipe. How many tomatoes should she expect to use to make her for 100 people?
You can do it two ways:
Method 1: Find the number of tomatoes needed for one person.
If five tomatoes are needed to make enough chilli for seven people, then
To find the number of tomatoes for one hundred people, simply multiple
Since you can't have 71.4 tomatoes, simply round up to the nearest whole number to get 72 tomatoes.
Method 2: Find out how many sevens go into one hundred and multiply that number by five to get the number of tomatoes needed.
Again, round up to the nearest whole number because you can't have 71.4 tomatoes.
It is astonishing just how much ratio is the underlying principle behind many calculations.
Using ratio in fraction format giving:
Let the count of tomatoes for 100 people be
Multiply both sides by 100
As you would not have part of a tomato we have 72
We need to change the 7 into 100. This is achieved by multiplying by