Question 1197432
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sister's sales = x
Robert's = {{{2.5x}}} 
x + 2.5x = 63   0r x = $18  and 2.5($18) = $45
Following true:
A. Robert's sister's sales total $18.00.
C. Robert's sister's sales are represented by x when solving 3.5x = 63 .

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