The expression is: 2y -20
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Twice the sum of 'x' and 'y' . . . 2(x+y) The sum of twice 'x' and 'y' . . . (2x+y)
When 25 is decreased by 20% the result 20.
There is insufficient information for us to even begin to understand this question. Please edit the question to include more context or relevant information. There is something missing in "... half the sum of [???] and y decreased ...".
2(x+y)=2x+2y
(2)x=Y-4