Question

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

Answer 1

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