SOLUTION: John can do a piece of work in 6 hours. With the help of mary he completes the job in 4 hours. How long would mary take to finish the job working alone

Question 919726: John can do a piece of work in 6 hours. With the help of mary he completes the job in 4 hours. How long would mary take to finish the job working alone
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
x How long it would take Mary to finish the job working alone
|Multiplying thru by 12x so as all denominators = 1
2x + 12 = 3x
12hr = x, How long it would take Mary to finish the job working alone
and...checking
2/12 + 1/12 = 1/4
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