Question 9
Country $A$ has $c\%$ of the world’s population and owns $d\%$ of the world’s wealth. Country $B$ has $e\%$ of the world’s population and $f\%$ of its wealth. Assume that the citizens of $A$ share the wealth of $A$ equally, and assume that those of $B$ share the wealth of $B$ equally. Find the ratio of the wealth of a citizen of $A$ to the wealth of a citizen of $B.$