document.write( "Question 121513: The world's most populous countries are China and India. As of mid-2005, the combined population of these two countries was estimated at 2.4 billion. If there were about 4/5 as many poeple living in India as China, what was the population of each country, to the nearest tenth of a billion? \n" ); document.write( "

Algebra.Com's Answer #89157 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"C%2BI=2.4\"$ China (C) plus India (I) equals 2.4 (billion).
\n" ); document.write( "2. $\"I=%284%2F5%29C\"$ India is 4/5 of China in population.
\n" ); document.write( "Substitute 2 into 1.
\n" ); document.write( " $\"C%2BI=2.4\"$
\n" ); document.write( " $\"C%2B%284%2F5%29C=2.4\"$
\n" ); document.write( " $\"%289%2F5%29C+=+2.4\"$
\n" ); document.write( " $\"C=2.4%2A%285%2F9%29\"$
\n" ); document.write( " $\"C=1.33\"$
\n" ); document.write( " $\"I=%284%2F5%29C\"$
\n" ); document.write( " $\"I=1.07\"$
\n" ); document.write( "Rounding to the nearest tenth of a billion,
\n" ); document.write( " $\"C=1.3\"$
\n" ); document.write( " $\"I=1.1\"$ \n" ); document.write( "

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