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8 January, 15:50

Working together, Rocco and Giulia can paint a room in 3 hours. It would have taken Rocco 7 hours to do the job alone. Which equation can be used to determine r, Giulia's rate of work in parts per hour? + 3r = 7 + 3r = 1 = r = 3r

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  1. 8 January, 16:52
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    The sum of the works they did should be 1. Thus the equation,

    3/7 + 3r = 1

    Simplifying,

    3r = 4/7
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