Question 946893
Let the margins at the sides and the top =
{{{ x }}}
The bottom margin = {{{ 2x }}}
I can now say:
{{{ ( 26 - 2x )*( 31 - 3x ) = 440 }}} in2
{{{ 806 - 62x - 78x + 6x^2 = 440 }}}
{{{ 6x^2 - 140x + 366 = 0 }}}
{{{ 3x^2 - 70x + 183 = 0 }}}
Use quadratic formula
{{{ x = ( -b +- sqrt( b^2 - 4*a*c )) / (2*a) }}}
{{{ a = 3 }}} 
{{{ b = -70 }}}
{{{ c = 183 }}}
{{{ x = ( -(-70) +- sqrt( (-70)^2 - 4*3*183 )) / (2*3) }}}
{{{ x = ( 70 +- sqrt( 4900 - 2196 )) / 6 }}}
{{{ x = ( 70 - sqrt( 2704 ) ) / 6 }}}
{{{ x = ( 70 - 52 ) / 6 }}}
{{{ x = 18/6 }}}
{{{ x = 3 }}}
{{{ 2x = 6 }}}
The side and top margins are 3 in
The bottom margin is 6 in
check:
{{{ ( 26 - 2x )*( 31 - 3x ) = 440 }}}
{{{ ( 26 - 6 )*( 31 - 9 ) = 440 }}}
{{{ 20*22 = 440 }}}
{{{ 440 = 440 }}}
OK