SOLUTION: Father and son completes a job in 20 days. If the father works 4 times as fast as the son how long would it take him to do the same job by himself

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Question 1032524: Father and son completes a job in 20 days. If the father works 4 times as fast as the son how long would it take him to do the same job by himself
Answer by josgarithmetic(39629) About Me  (Show Source):
You can put this solution on YOUR website!
PERSON     RATE
FATHER     1%2Fx
SON        1%2F%284x%29
BOTH      1%2Fx%2B1%2F%284x%29=1%2F20