Albert Barnes Commentary Daniel 5:16

"But I have heard of thee, that thou canst give interpretations, and dissolve doubts; now if thou canst read the writing, and make known to me the interpretation thereof, thou shalt be clothed with purple, and have a chain of gold about thy neck, and shalt be the third ruler in the kingdom." — Daniel 5:16 (ASV)

And I have heard of thee... (Daniel 5:11).

Canst make interpretations – Margin, “interpret.” Chaldee, “interpret interpretations.” The meaning is that he was skilled in interpreting or explaining dreams, omens, etc.

And dissolve doubts – See the notes at Daniel 5:12.

Now, if thou canst read the writing... thou shalt be clothed with scarlet... – This was the reward which at first he had promised to anyone who was able to do it, and as all others had failed, he was willing that it should be offered to a Jew.