AQuA-RAT train #87137 · Arithmetic · Ratio & rate

Randy can rebuild an automobile engine in a hours

Randy can rebuild an automobile engine in a hours. Alvin can rebuild the same engine in b hours. If Randy and Alvin work together at their respective rates to rebuild the engine, which of the following represents the portion of the job that Alvin will not have to complete?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #87137

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