In the above number, A and B represent the tens and units digits, respectively. If the above number is divisible by 45, what is the greatest possible value of B x A?	Pick one.
A) 0 B) 5 C) 10 D) 15 E) 20
I also was confused when I was looking forabove number:D   As far as I understood, 45 is a factor of AB. In other words, the values of B (units digits can be 5 or 0. Better to have option for 5 in this case to havebigger result). Now let's try 45x1 (A=4, B=5 respectively we have =20). This is the greatest possible value of B x A.   IMO 20.
<result>E</result>
In the above number, A and B represent the tens and units digits, respectively. If the above number is divisible by 45, what is the greatest possible value of B x A?