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

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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) About Me  (Show Source):
You can put this solution on YOUR website!
y, Brother
x, Sister

Description:%28%28y-5%29%2B%28x-5%29%29%2F2=35
-
%28y%2Bx-10%29%2F2=35
y%2Bx-10=70
y%2Bx=80, total of their ages now.

80%2F2=highlight%2840%29

Average of will move along with the age of each in the same way.

Answer by MathTherapy(10552) About Me  (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: highlight_green%28matrix%281%2C3%2C+80%2F2%2C+%22=%22%2C+40%29%29