Question 776616
Let {{{ r }}} = the remainder of the pie
{{{ 1/6 + 1/5 + r = 1 }}}
where {{{ 1 }}} is the whole pie
Multiply both sides by {{{ 30 }}}
{{{ 5 + 6 + 30r = 30 }}}
{{{ 30r = 30 - 11 }}}
{{{ 30r = 19 }}}
{{{ r = 19/30 }}}
There is 19/30 of the pie left
check:
{{{ 1/6 + 1/5 + r = 1 }}}
{{{ 5/30 + 6/30 + 19/30 = 1 }}}
{{{ 30/30 = 1 }}}
{{{ 1 = 1 }}}
OK