Question 1158252
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It can be solved in much easier manner.



<pre>
Let x be the age of Jill, who is the youngest.

The the Jac's age is 3x, while the Jon age is 3*(3x) = 9x.


Jon is 16 yaers older than Jill

    9x - x = 16.


It implies

    8x     = 16

     x     = 16/8 = 2.


So, Jill is 2 years old.  Hence, Jac is  3x = 3*2 = 6 years old.    <U>ANSWER</U>
</pre>

Solved.