Question 281899
Let {{{s}}} = Shea's height now
Let {{{a}}} = Ara's height now
When their heights were the same:
{{{s - .2s = a - .5*(.2s)}}}
{{{s = 60}}} 
---------
{{{60 - .2*60 = a - .5*12}}}
{{{48 = a - 6}}}
{{{a = 54}}}
Ara is 54 in tall -(D)
Check:
{{{.2s = 12}}}
{{{60 - 12 = 48}}}
48  in is their heights when both were the same
{{{a = 48 + 12/2}}}
{{{a = 54}}} in
OK