Question 624439
Let J be Jose's age today and s be his son's age today. You are told
{{{J = s + 27}}}
{{{(J+10) = 2 * (s+10)}}}
{{{J + 10 = 2s + 20}}}
{{{J = 2s + 10}}}
Now you can substitute in the value for J in the first equation at the top into this last one
{{{s + 27 = 2s + 10}}} now solve for s
{{{27-10 = 2s - s}}}
{{{17 = s}}} so his son is 17 today
Which makes Jose 17+27 = 44

Check your answer based on what their ages will be in 10 years.
Is 54 = 2*27