# If 15 workers can build a classroom in 30 days, how many days will it takes to 6 workers to build the same classroom?

1
by SimEliza

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.
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. =)
^_^