SOLUTION: Twin brothers, Billy and Bobby can mow the their lawn together in 65 minutes. billy could mow the lawn by himself in 20 minutes less than it would take Bobby. How long would it tak

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Question 1165519: Twin brothers, Billy and Bobby can mow the their lawn together in 65 minutes. billy could mow the lawn by himself in 20 minutes less than it would take Bobby. How long would it take Bobby to mow the lawn by himself?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Billy             1/(b-20)

Bobby             1/b

Together          1/65

Solve the equation, 1%2F%28b-20%29%2B1%2Fb=1%2F65.