PUZZLE : Find number... (Solution)

You can find the problem at this URL...
https://teachyleaf.blogspot.com/2020/04/puzzle-find-number.html

Each number is calculated from the summation of all the digits of its upper two numbers.
e.g. 7+2+9+9 = 27, 2+7+4+5 = 18 and so on...

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