A massage costs $81.50 per hour. How much will a massage for 2.5 hours cost? $

1 answer:

6 0

$\bf \begin{array}{ccll}
\$&hours\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
81.50&1\\
x&2.5
\end{array}\implies \cfrac{81.50}{x}=\cfrac{1}{2.5}\implies \cfrac{81.50\cdot 2.5}{1}=x$

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