averages: "A person is takes phone calls for 20 days of the month...."

mrbigshot210

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Feb 28, 2018
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A person is takes phone calls for 20 days of the month. They need to hit a goal of an average of (×) or 5 mins on thier phone calls at the end of the 20 day cycle. We are on day (x) (it could be day 2 or day 20) and thier current average time on calls is (x) 8 mins. What average (×) do they need to make each of the remaining days to hit the goal of (×) 5 mins.

What formula would i use to calculate this and it will be recalculated daily as the average call times will change daily?
 
Remaining average = (remaining minutes)/(remaining days).
 
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