Question

It cost Taub $5.00 to send 100 text messages. How many text messages did she send if she spent $9.55

Answer 1

$\begin{array}{ccll} \ {data-answer}amp;messages\\ \cline{1-2} 5 & 100\\ 9.55& x \end{array} \implies \cfrac{5}{9.55}~~=~~\cfrac{100}{x} \\\\\\ 5x=955\implies x=\cfrac{955}{5}\implies x = 191$