Question 1205729
<pre>
                INITIALLY           NEW PORT

ADULT             3x                 3x+116

CHILDREN          {{{highlight(x)}}}                  x+50

DIFFERENCE                            1216
</pre>
More adults than children on board before leaving new port.
{{{3x+116-x-50=1216}}}

{{{2x=1216-116+50}}}

{{{highlight(x=575)}}}