SOLUTION: A can finish a certain job in 12 days . A&B can finish same job in 8 days.how many day will take B to complete that job alone?

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Question 502421: A can finish a certain job in 12 days . A&B can finish same job in 8 days.how many day will take B to complete that job alone?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
A can finish a certain job in 12 days . A&B can finish same job in 8 days.how many day will take B to complete that job alone?
.
Let x = time (days) it takes B to complete job alone
then
8(1/12 + 1/x) = 1
multiply both sides by 12x:
8(x + 12) = 12x
8x + 96 = 12x
96 = 4x
28 days = x