TOUGH
TOUGH
TOUGH
+TOUGH

PUZZLE
Here are the six solutions to the puzzle.
37524*4=150096
79152*4=316608
80294*4=321176
87524*4=350096
92785*4=371140
94715*4=378860
FK's friend, however is seeking just one of them.
Here is how FK worked it out.
P must be 3 (since P=1 would produce a single solution); likewise, U
must be 5 or 7, Z must be 0 or 1, L must be 9, and E must be 0 or 6: the
only solution that fits all of these conditions is 87524*4=350096.
Please also see Penny's explanation at
http://perplexus.info/show.php?pid=5706&cid=38218
