Question 457331
Let {{{s}}} = number of seats on the plane

given:
{{{ (2/3)*s }}} = seats occupied
{{{ 68 }}}  = number who are men
{{{ ((2/3)*s )*( .2 + .25 + .125) }}} = passengers who are not men
{{{ ((2/3)*s)*.575 + 68 = (2/3)*s }}} (men + others fill 2/3 of plane)
{{{ 1.15s + 204 = 2s }}}
{{{ .85s = 204 }}
{{{ s = 240 }}}
There are 240 seats on the plane
check answer:
{{{ (2/3)*240 = 160 }}}
{{{ 160 - 68 = 92 }}} (92 of the (2/3)*s are not men)
{{{ ((2/3)*s )*( .2 + .25 + .125) = 92 }}}
{{{ 160*( .2 + .25 + .125) = 92 }}}
{{{ .575*160 = 92 }}}
{{{ 92 = 92 }}}
OK