Answer
22.5 tons
Work Step by Step
weight = constant * width * height^2/length
$12 = k*.5*1/3^2/10$
$12=.5k*1/9*1/10$
$12=.5k*1/90$
$12=1/2*k*1/90$
$12=k*1/180$
$12*180=k*1/180*180$
$2160 = k$
$w=2160*w*h^2/l$
2/3 ft wide, 1/2 ft high, 16 ft long
$w=2160*w*h^2/l$
$w=2160*2/3*1/2^2/16$
$w=2160*2/3*1/4*1/16$
$w=135*2/3*1/4$
$w=270/3*1/4$
$w=90*1/4$
$w=90/4$
$w=22.5$
