SOLUTION: 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 man

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 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 man      Log On


   

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?
Answer by Fombitz(32388) About Me  (Show Source):
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1.C%2BI=2.4 China (C) plus India (I) equals 2.4 (billion).
2.I=%284%2F5%29C India is 4/5 of China in population.
Substitute 2 into 1.
C%2BI=2.4
C%2B%284%2F5%29C=2.4
%289%2F5%29C+=+2.4
C=2.4%2A%285%2F9%29
C=1.33
I=%284%2F5%29C
I=1.07
Rounding to the nearest tenth of a billion,
C=1.3
I=1.1