Question 1145585
.
<pre>
Let Y be the Yaw age.


Then from the condition, Kwasi's age is  (47 + 4 + 4 - Y) = 55 - Y.


From the condition, you have this proportion


    {{{(55-Y)/Y}}} = {{{2/9}}}.


Hence,

    9*(55 - Y) = 2Y

    9*55- 9Y = 2Y

    9*55 = 2Y + 9Y = 11Y.


Hence,  Y = {{{(9*55)/11}}} = 9*5 = 45 is the Yaw's age now. 
</pre>

Solved.