Question 1040695: the mean of five positive numbers is 4 when another number is added ,the mean number becomes 8 .find the number added Answer by ikleyn(52794) (Show Source):
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the mean of five positive numbers is 4 when another number is added ,the mean number becomes 8. find the number added
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= 4*5 = 20 <--- The sum of the five numbers.
= 8*6 = 48 <--- The sum of the six numbers.
= + x ---> x = = 48 - 20 = 28.
Answer. The number 28 was added.
Notice. The condition that the numbers are positive - is irrelevant.
