Riddle of the Day

[Gizmokid2005]

I am as old as John will be when I am twice as old as John was when my age was half the sum of our present ages. John is as old as I was when John was half the age he will be 10 years from now. How old am I?

ANSWER (Congrats Precidia): I am 40. John is 30.

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NEXT RIDDLE:

An architect was asked to design a square house with the window in each wall having a southern exposure. How could this be done?