# How is ratio used in everyday life?

May 18, 2016

A very common use of ratio income spent on food to that on the rest

Example: ("Expenditure for food")/("Total free income-expenditure for food")-> "say " 30/70

#### Explanation:

Do not confuse this with a fraction. The total number of 'parts' is 30 on food and 70 on the rest making a total of 100 parts

So as a fraction of total free cash the food as percent is $\frac{30}{100}$

Suppose you had a litre of drink mix that had 15 parts flavouring to 130 parts water.

The total number of parts is $130 + 15 = 145$

So as a ratio this would be $\left(\text{flavouring")/("water}\right) \to \frac{15}{130}$

But as a fraction of the whole it would be
$\left(\text{flavouring")/("water + flavouring}\right) \to \frac{15}{145}$