SOLUTION: The sum of the ages of two sisters is 20 years. Two years from now one of them will be three times as old as other then. Find their present age

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Question 993067: The sum of the ages of two sisters is 20 years. Two years from now one of them will be three times as old as other then. Find their present age
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
O-older sister's age
Y-younger sister's age
O%2BY=20
In two years,
O%2B2=3%28Y%2B2%29
From the first equation,
O=20-Y
Substitute,
20-Y%2B2=3Y%2B6
-4Y=-16
Y=4
So then,
O%2B4=20
O=16