When Brooks painted more he used 6/12 of what was left(1/2 of what was left)
These are fractions? Like 13/20 and 7/10? Is so the symbol would be 13/20 < 7/10 because 7/10 is a higher fraction than 13/20
We notice that reflecting ABC with respect to the vertical red line, we get A'B'C'.
So, ABC is mapped onto A'B'C by a reflection.
Answer: Reflection