Homework Help: Math

Posted by Grace on Tuesday, August 7, 2012 at 9:50pm.

If the average of 10 numbers is 10 and the sum of five of the numbers is -25 what is the average of the other 5 numbers?

Math - Reiny, Wednesday, August 8, 2012 at 8:47am
sum of all 10 numbers is 100

sum of one set of 5 numbers is -25
so the sum of the other set of 5 numbers must be 125
(125 + (-25) = 100 )

and the average of that second set of 5 numbers must be 125/5 or 25

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