SOLUTION: it took 4 workers 9 days to complete a renovation work.how many workers would it take to complete the same work in 6 days?

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Question 937625: it took 4 workers 9 days to complete a renovation work.how many workers would it take to complete the same work in 6 days?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
RT=J rate time job.

Let r = work rate of one worker.
Let n = how many workers for the question.

Amount of job is 1 renovation.
highlight%284r%2A9=1=nr%2A6%29

That is an equation with apparently two unknown variables, but r is a factor on both sides, so it is a common factor, and the equation becomes just of one variable, n.