Step by step explanation:
If in her family 3 of them do not like roller coasters and there are a total of 5, then there are 2 who do like it.
We can write the following proportion:
[tex]\frac{x}{100}=\frac{2}{5}[/tex]
There are 2 out of 5 who like it and we want to find the percentage:
[tex]x=\frac{2\cdot100}{5}=\frac{200}{5}=40[/tex]
Answer:
40%
