Robert and his younger sister are selling gift wrap to raise funds for the high school band. Robert's sales are 2.5 times his sister's sales. Their total sales together can be represented by the equation x+2.5x=63 .
Which of these statements are true? Choose ALL that are correct. (multiple choice)
A: Robert's sister's sales total $18.00.
B: Robert's sales are represented by x when solving 3.5x=63.
C: Robert's sister's sales are represented by x when solving 3.5x=63 .
D: Robert's sales are represented by x when solving 2.6x=63 .
E: Robert's sales total $25.20.