Question 1088111

Please help me solve this word problem:6 years ago, a father was seven times as old as his son. Again, 4 years later, the father will be only thrice as old as his son. How old is the son now? 
<pre>Correct answer: {{{highlight_green(matrix(1,5, Son, is, "currently:", 11, years-old))}}}
IGNORE the other person's USUAL BIZARRE/NONSENSICAL/RIDICULOUS, not to mention WRONG, WRONG answer!