SOLUTION: Twin​ brothers, Billy and​ Bobby, can mow their​ grandparent's lawn together in 99 minutes. Billy could mow the lawn by himself in 45 minutes less time that it would take Bo

Algebra ->  Human-and-algebraic-language -> SOLUTION: Twin​ brothers, Billy and​ Bobby, can mow their​ grandparent's lawn together in 99 minutes. Billy could mow the lawn by himself in 45 minutes less time that it would take Bo      Log On


   

Question 1134716: Twin​ brothers, Billy and​ Bobby, can mow their​ grandparent's lawn together in 99 minutes. Billy could mow the lawn by himself in 45 minutes less time that it would take Bobby. How long would it take Bobby to mow the lawn by​ himself?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Bobby, 1%2F%28L%2B45%29
Billy, 1%2FL

Bobby And Billy Together, 1%2F%28L%2B45%29%2B1%2FL=1%2F99;
Solve for L.



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How long would it take Bobby to mow the lawn by​ himself?
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Bobby, 1%2FB
Billy, 1%2F%28B-45%29
Both Together, 1%2FB%2B1%2F%28B-45%29=1%2F99----solve for B.