AMC 12 2016b Problem 8

A thin piece of wood of uniform density in the shape of an equilateral triangle with side length $3$ inches weighs $12$ ounces. A second piece of the same type of wood, with the same thickness, also in the shape of an equilateral triangle, has side length of $5$ inches. Which of the following is closest to the weight, in ounces, of the second piece?

\textbf{(A)}\ 14.0 \textbf{(B)}\ 16.0 \textbf{(C)}\ 20.0 \textbf{(D)}\ 33.3 \textbf{(E)}\ 55.6