SOLUTION: Ryan can do a job in 12 days. After he has worked for 4 days he is joined by Sandy. The finish the job together in 2 more days. How long will it take Sandy to do the whole job alon

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Question 1011882: Ryan can do a job in 12 days. After he has worked for 4 days he is joined by Sandy. The finish the job together in 2 more days. How long will it take Sandy to do the whole job alone?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
RT=J relates each person's rate, time, amount of work or amount of job.
Rate unit is JOB/DAYS.

Ryan's rate, 1%2F12
Sandy's rate, 1%2Fx, you do not know and must solve this.
Combined rate, 1%2F12%2B1%2Fx

Ryan worked alone 4 days, and then Ryan & Sandy worked together for 2 days, and the job was finished (1 whole job).

highlight%28highlight_green%28%281%2F12%294%2B%281%2F12%2B1%2Fx%29%2A2=1%29%29.

Ask further if you need help with the arithmetic or algebra steps.



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Sandy's rate is 1%2F4, or x=4.