Question 903656
I would logically guess, 114, without trying to do algebra in symbols and equation.


2n+1, 2n+3, 2n+5.
Their sum {{{2n+1+2n+3+2n+5=57}}}
{{{6n+9=57}}}
{{{6n=48}}}
{{{n=48/6}}}
{{{n=8}}}


The original numbers would be 17, 19, 21.


NOW, if those are doubled and then summed:
{{{2(17+19+21)}}}
{{{2*57}}}
{{{highlight(114)}}}