Question 962261

Lucy adds the year of her birth {{{x}}}, 
the year of her mother`s birth{{{y}}} , 

{{{x+y}}}

Lucy age,   {{{2015-x}}}
and 
her mother`s age {{{2015-y}}}

{{{2015-x+2015-y}}}
{{{4030-x-y}}}
{{{4030-(x+y)}}}

What result would she get:

{{{4030}}}