Question 159979
About 4.9 million households had one brand of personal computers in 2001. The use of these computers grew at an average rate of .275 million households a year.
Eq: N = 4.9 + 0.275x million
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 In 2001, about 2.5 millions households used another type of computer. The use of these computers grew at an average rate of .7 million households a year.
Eq: P = 2.5 + 0.7x million
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 How long will it take for the two types of computers to be in the same number of households? 
4.9 + 0.275 = 2.5 + 0.7x
2.4 = 0.425x
x = 5.647 years
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Cheers,
Stan H.