SOLUTION: the average age of a brother and sister was 35 years,at 5 years ago.what will be their average age at present?

Question 1080311: the average age of a brother and sister was 35 years,at 5 years ago.what will be their average age at present?

Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
y, Brother
x, Sister

Description:
-

, total of their ages now.

Average of will move along with the age of each in the same way.
Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!

the average age of a brother and sister was 35 years,at 5 years ago.what will be their average age at present?

Average age 5 years ago: 35
Sum of the ages, 5 years ago: 2(35), or 70
Sum of the ages now: 70 + 2(5), or 70 + 10, or 80
Current average of the 2 ages:
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