Machine $A$ currently takes $x$ hours to complete a certain job. Machine $B$ currently takes $y$ hours to comple

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by Gmat_mission » Sun Aug 08, 2021 10:45 am

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Machine $A$ currently takes $x$ hours to complete a certain job. Machine $B$ currently takes $y$ hours to complete the same job. If $x=4y,$ by what percent will $x$ have to decrease so that $A$ and $B$ together can complete the job in $\dfrac{3y}8$ hours?

A. $15\%$
B. $25\%$
C. $30\%$
D. $62,5\%$
E. $85\%$

Answer: E

Source: Manhattan GMAT

Source: Beat The GMAT — Problem Solving | Sun Aug 08, 2021 10:45 am

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