Question 55407
n + d + q = 36
d = q + 4
n = 2q

Substitute the 2nd and third equations into the 1st so that you have ONLY the q to solve for.

{{{ n + d + q = 36 }}}
{{{ 2q + q + 4 + q = 36 }}}
{{{ 4q + 4 = 36 }}}
{{{ 4q = 32 }}}
{{{ q = 8 }}}


now plug 8 into the 3rd equation
{{{ n = 2q }}}
{{{ n = 2(8) }}}
{{{ n = 16 }}}


now plug n and q into the 1st equation
{{{ n + d + q = 36 }}}
{{{ 16 + d + 8 = 36 }}}
{{{ 24 + d = 36 }}}
{{{ d = 12 }}}

d = 12
n = 16
q = 8
total = 36