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Start the planMachine \(A\) can complete a certain job in \(x\) hours. Machine \(B\) can complete the same job in \(y\) hours. If \(A\) and \(B\) work together at their respective rates to complete the job, which of the following represents the fraction of the job that \(B\) will not have to complete because of \(A\)'s help?
A) \(\dfrac{x - y}{x + y}\)
B) \(\dfrac{x}{y - x}\)
C) \(\dfrac{x + y}{xy}\)
D) \(\dfrac{y}{x - y}\)
E) \(\dfrac{y}{x + y}\)
Answer: E
Source: GMAT Club Tests
A) \(\dfrac{x - y}{x + y}\)
B) \(\dfrac{x}{y - x}\)
C) \(\dfrac{x + y}{xy}\)
D) \(\dfrac{y}{x - y}\)
E) \(\dfrac{y}{x + y}\)
Answer: E
Source: GMAT Club Tests
