Answer:
The given expression is
[tex]52-3y[/tex]
If [tex]y=2[/tex], then the expression would be equal to
[tex]52-3(2)=52-6=46[/tex]
As you can observe, the expression is equal to 46 not to 20.
Adam's answer is incorrect, because 46 isn't equal to 20, neither the expression, maybe he made a mistake when he did the operations.