Question 1122914
.
<pre>
Paul is the youngest.


Paul + Fiona + Sara      = 60

P    + (P+3) + ((P+3)+3) = 60

3P + 9 = 60


3P = 60 - 9 = 51  ====>  P = 51/3 = 17.


<U>Answer</U>.  Paul is 17 years old.
</pre>

Solved.