SOLUTION: I multiplied my age by 4, added 20, divided by 2, and then subtracted twice my age. What number did I finally get?

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Question 722007: I multiplied my age by 4, added 20, divided by 2, and then subtracted twice my age. What number did I finally get?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Let p = someone's age.
A%28p%29=%284p%2B20%29%2F2-2p
=(2p+10)-2p
=2p+10-2p
=highlight%2810%29

A%28p%29=10, no matter what the value of p used. What is the predictive value or meaning of that function?