Jawapan

2016-03-16T13:19:58+08:00
8 1/2ft = 12 1/3ft
8 6/12ft = 12 4/12ft

if 4 1/4ft = 4 3/12ft of cedar was used
that is half of 8 6/12ft

so 12 4/12ft รท 2
= 6 2/6ft = 6 1/3ft