SOLUTION: I am 20 years older than twice my daughter's age. How old is my daughter?

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Question 1133879: I am 20 years older than twice my daughter's age. How old is my daughter?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = my age
Let +y+ = my daughter's age
+x+=+2y+%2B+20+
subtract +20+ from both sides
+x+-+20+=+2y+
Divide both sides by +2+
+y+=+%281%2F2%29%2Ax+-+10+
In words, this is saying that my daughter's age
is ten years less than half my age
--------------------------------------------------
check:
Suppose I am 40, or +x+=+40+, then
+40+=+2y+%2B+20+
+20+=+2y+
+y+=+10+
and
+y+=+%281%2F2%29%2Ax+-+10+
+y+=+%281%2F2%29%2A40+-+10+
+y+=+20+-+10+
+y+=+10+
OK