SOLUTION: A group of 3 workers need 20 days to do a certain job. How long would it take a group of 4 workers to do the same job, if each worker performs at the same rate?

Question 976149: A group of 3 workers need 20 days to do a certain job. How long would it take a group of 4 workers to do the same job, if each worker performs at the same rate?
Answer by josgarithmetic(39614) (Show Source): You can put this solution on YOUR website!
This is familiar. Check my solutions from up to yesterday and you might find the same question already answered.

r, rate for one worker;
t, unknown number of days for four workers;

RT=J, basic uniform rates equation for doing a task, piece of work, job. One job is shown in
your example as "1".

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