Part-timers 6344

Certain work was to be done by 21 workers during an eight-hour workday, due in 12 days. After five days, temporary workers came to their aid. They all worked together for 7 hours a day and finished the job in 6 days. How many part-timers were there?

Correct answer:

n =  7

Step-by-step explanation:


21·12·8 = 21·5·8 + (21+n)·7·6

42n = 294


n = 294/42 = 7

n = 7

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