# Difference between revisions of "1993 AHSME Problems/Problem 9"

## Problem

Country $A$ has $c\%$ of the world's population and $d\%$ of the worlds 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 $B$.

$\text{(A) } \frac{cd}{ef}\quad \text{(B) } \frac{ce}{ef}\quad \text{(C) } \frac{cf}{de}\quad \text{(D) } \frac{de}{cf}\quad \text{(E) } \frac{df}{ce}$

## Solution

If country $A$ has $\frac{d}{100}$ of the wealth in the world and $c$ people that means that each person has $\frac{d}{100c}$ of all the wealth in the world. Using a similar argument for Country $B$ we have that each person has $\frac{f}{100e}$ of the wealth In the world. Evaluating the desired fraction gives us $\frac{de}{cf}$ $\fbox{D}$