You can put this solution on YOUR website! .
The sides of the quadrilateral are consecutive numbers.
If the perimeter is 160, how long is each side ?
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Write an equation as you read the problem
n + (n+1) + (n+2) + (n+3) = 160
4n + 6 = 160
4n = 160 - 6 = 154
n = 154/4 = 38.5
and you see that there is no solution in integer numbers.
It means that the problem is a FAKE : such a quadrilateral as described DOES NOT EXIST.