SOLUTION: The average temperature of the first three days of a week is 27 degree and of the next three days is 29degree .If the average of whole of the week is 28.5 degree the temperature of

Question 1101006: The average temperature of the first three days of a week is 27 degree and of the next three days is 29degree .If the average of whole of the week is 28.5 degree the temperature of the last day of the week is?
Found 2 solutions by ankor@dixie-net.com, greenestamps:
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The average temperature of the first three days of a week is 27 degrees
and of the next three days is 29degrees .
If the average of whole of the week is 28.5 degree the temperature of the last day of the week is?
:
let s = last day average temp
:
= 28.5
81 + 87 + s = 7(28.5)
168 + s = 199.5
s = 199.5 - 168
s = 31.5 degrees
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

Here is an alternative solution method that I like to use when the numbers being averaged are all close together. Try it and see if it "works" for you.

With this method, we compare each of the known values to the known average to find how far away they are; from that we can determine how far from the average the missing value has to be.

In this example, the final average is 28.5.

We have three values of 27; each of them is 1.5 below the average; so together those three values are 4.5 below the average.

We also have three values of 29; each of the is 0.5 above the average; so together those three value are 1.5 above the average.

Then the "balance" for the six known value is 3 below the average.

That means the missing value must be 3 above the average: 28.5+3 = 31.5.
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