Question 462845
let,
k -> kelly
r -> renee
n -> nina

given,
k + r + n=20000
k = r - 4000
{{{ n = 2r/3 }}}
thus,
{{{ (r-4000) + r + (2r/3) = 20000 }}}
{{{ 2r + 2r/3 = 20000 + 4000 }}}
{{{ (6r + 2r)/3 = 24000 }}}
{{{ 8r = 24000 * 3}}}
{{{ r = (24000 * 3)/8 }}}
{{{ r = 9000 }}}
and kelly is 9000-4000=5000
nina is {{{ (2 * 9000)/3 }}} = 6000