Question 942767
Let {{{ n }}} = number of contributors 
{{{ 3.6*10^6  / n = 3.6*10^6 / ( n + 2 ) + 3*10^5 }}}
Divide both sides by {{{ 10^5 }}}
{{{ 3.6*10 / n = 3.6*10 / ( n + 2 ) + 3 }}}
Multiply both sides by {{{ n*( n+2 ) }}}
{{{ 36*( n+2 ) = 36n + 3*n*( n+2 ) }}}
{{{ 36n + 72 = 36n + 3n^2 + 6n }}}
{{{ 3n^2 + 6n - 72 = 0 }}}
{{{ n^2 + 2n - 24 = 0 }}}
{{{ ( n + 6 )*( n - 4 ) = 0 }}} ( by looking at it )
{{{ n = -6 }}} ( can't use a negative answer )
{{{ n = 4 }}}
4 organizations contributed to the project
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check:
{{{ 3.6*10 / n = 3.6*10 / ( n + 2 ) + 3 }}}
{{{ 3.6*10 / 4 = 3.6*10 / 6 + 3 }}}
{{{ 36/4 = 36/6 + 3 }}}
{{{ 9 = 6 + 3 }}}
{{{ 9 = 9 }}}
OK