What Number Comes Next in Series?

This is Number Series Question to challenge your brain. In this number series question, you are shown some numbers which follow a certain mathematical or logical pattern. Decipher this pattern which is followed by these numbers and find the next number in this series. 

What Number Comes Next in Series?

The answer to this "Number Series Question", can be viewed by clicking on the answer button.

The Answer is 50.
This series can be broken into two simple series as below
80 70 60 50 ....... so on and
10 15 20 25 ...... so on.

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