Question 280081
The lengths are:
{{{L}}}, {{{L/2}}}, {{{L/4}}}, {{{L/8}}}
{{{L + L/2 + L/4 + L/8 = 15}}}
{{{L*(1 + 1/2 + 1/4 + 1/8) = 15}}}
{{{L*(15/8) = 15}}}
{{{L = 8}}}
{{{L/2 = 4}}}
{{{L/4 = 2}}}
{{{L/8 = 1}}}
{{{8 + 4 + 2 + 1 = 15}}}
(C) 8 in