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2015-09-15T14:53:20+08:00

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Since this is a work problem then we'll have rate.
15 workers can finish the job in 30 days so we'll have the rate as
R = 1/(t×n)
(R=rate per person)
R = 1/(30×15)
R = 1/450
----
If there are only 6 workers then
R=1/450
n=6
R=1/(t×n)
(1/450)=(1/6t)
cross multiply
6t=450
t=75
therefore it takes 75days for 6workers to do the same job.
0
Yes, as the no. of workers decrease, the time will take increases, and as the no. of workers increases, the time will take decreases.

She is right.
sorry
i thought it was going to be easy........
there's nothing wrong in trying. =)
^_^