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2015-07-16T11:37:51+08:00

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 Let x be the time it takes for Maria to clean the house alone.
Let x +4 be Jane's time to clean the house.

Solve:

x + x+4 = 8
2x+4 = 8
2x = 8 - 4
2x = 4
 \frac{2x}{2}  =  \frac{4}{2}
x = 2 hours Maria cleans the house

x + 4 = 
2 +4 = 6  hours Jane is cleaning the house


checking

x+ x+4 = 8
2 + 6 = 8

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