Answer:
3 brothers.
Step-by-step explanation:
You know that Kim made [tex]1\frac{1}{4}[/tex] quarts of a fruit smoothie.
Observation: [tex]1\frac{1}{4}[/tex] is the same as saying [tex]\frac{5}{4}[/tex] because, [tex]1\frac{1}{4} =1+\frac{1}{4} =\frac{4.1+1}{4} =\frac{5}{4}[/tex], then Kim made [tex]\frac{5}{4}[/tex] of a fruit smoothie.
Now, the problem says that Kim drank [tex]\frac{1}{5}[/tex] of her smoothie, this means:
[tex]\frac{5}{4} .\frac{1}{5}=\frac{1}{4}[/tex]
Kim drank [tex]\frac{1}{4}[/tex] quart of the smoothie, the rest of the smoothie is:
[tex]\frac{5}{4}- \frac{1}{4}=\frac{4}{4}[/tex]
Now to know how many brothers Kim has we have to divide the rest of the smoothie ([tex]\frac{4}{4}[/tex]) in [tex]\frac{1}{3}[/tex], this is:
[tex]\frac{4}{4} :\frac{1}{3} =\frac{12}{4} =3[/tex]
Then Kim has 3 brothers.
