Answer:
Ratio defined as the relative sizes of two or more values.
i.,e [tex]\frac{a}{b} = a:b[/tex]
As per the statement:
on every three hamburgers that McDonald's makes they use 9 pickles.
Unit rate per burger = [tex]\frac{\text{Number of pickles}}{\text{Number of burger}} = \frac{9}{3} = \frac{3}{1}[/tex]
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:
[tex]\text{Number of pickles} = \text{Unit rate per burger} \times 100[/tex]
then;
[tex]\text{Number of pickles} =3 \times 100[/tex] = 300
Therefore, 300 pickles will they use on a hundred burgers.