Answer:
Able's younger sister is 9.5 years old.
Explanation:
So first let's organize this information,
Able:X
Able's sister: X-4
Able's older brother: 2X
So let's make an equation, X+X-4+2X=32
Which simplified is 4x-4=32
4x=38
x=9.5
I do not know, but this is the right answer even though it feels wrong.