Question 123384
Let call urban population, U, and rural, R.
From the first sentence you know,
1.{{{U+R=221}}} 221 million people total
2.{{{U=2.25R}}} Urban is 2.25 times rural
Substitute 2 into 1.
1.{{{U+R=221}}} 
{{{(2.25R)+R=221}}}
{{{3.25R=221}}}
{{{R=221/3.25}}}
{{{highlight(R=68)}}}
From 2,
{{{U=2.25R}}}
{{{U=2.25(68)}}}
{{{highlight(U=153)}}}