Question

What is 3/4 inches of 15 ft

Answer 1

so .. in 1foot, there are 12inches... thus, in 15feet, there are 15*12 inches

how many in 3/4 of an inch? well
`\bf \begin{array}{ccllll} feet&inches\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 15&15\cdot 12\\ x&(3)/(4) \end{array}\implies \cfrac{15}{x}=\cfrac{15\cdot 12}{(3)/(4)}\implies \cfrac{15}{x}=\cfrac{(15\cdot 12)/(1)}{(3)/(4)} \\\\\\ \cfrac{15}{x}=\cfrac{15\cdot 12}{1}\cdot \cfrac{4}{3}\implies \cfrac{15}{x}=\cfrac{15\cdot 12\cdot 4}{3}`

solve for "x"