Answer:
Ratio defined as the relative sizes of two or more values.
i.,e
![(a)/(b) = a:b](https://img.qammunity.org/2020/formulas/mathematics/middle-school/tud2hzn9bu0ecb00ptn7k6ky9nriawx8pr.png)
As per the statement:
on every three hamburgers that McDonald's makes they use 9 pickles.
Unit rate per burger =
![\frac{\text{Number of pickles}}{\text{Number of burger}} = (9)/(3) = (3)/(1)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/k6ubd16ycmzp6ynllnqlsre9t4ulsbjckt.png)
Then the ratio in the simplest form is: 3 : 1
We have to find how much will they use on a 100 burgers.
By definition of unit rate:
![\text{Number of pickles} = \text{Unit rate per burger} * 100](https://img.qammunity.org/2020/formulas/mathematics/middle-school/wqrs6h0dnw8dhrdecsuz3oe4a4lms5838x.png)
then;
= 300
Therefore, 300 pickles will they use on a hundred burgers.