help asap plz

A 15-person road crew is scheduled to finish repairing a highway in 12 days. On the morning of the fifth day, several new workers join the crew and, together, they complete the remaining repairs in 6 days. How many new workers joined the crew?

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  1. 15 * 12 = 180
    so
    The whole job requires 180 man days

    They worked for 4 days
    so did 15 * 4 = 60 man days

    they have 120 man days of work left
    120 / n = 6
    n = 20 men on the job

    so 5 new men joined

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  2. no!!!! i didnt do it for free, they pay you money! jk the answer is 20/4, simplified is 5

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