Question

Hank is painting houses this summer. He can paint 7 houses in 5 weeks. At this rate, how many houses did he paint in 18 weeks?

Answer 1

$\begin{array}{ccll} houses&weeks\\ \cline{1-2} 7&5\\ x&18 \end{array}\implies \cfrac{7}{x}=\cfrac{5}{18}\implies 126=5x \\\\\\ \cfrac{126}{5}=x\implies 25\frac{1}{5}=x$