A + BBA = 3012
AB + BA = 357
ABB + A = 2757
ABBA = ?
A + BBA = 3012
AB + BA = 357
ABB + A = 2757
ABBA = ?
<font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>

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I make it <span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>29652 </font color=yellow></span hi> - but I didn't like some of the intermediate results I used so I could well be wrong.
StuartR
I get <span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>43,962</font color=yellow></span hi>
<span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>The numbers are decimals (base 10). The letters are base 16, the "A" represents a 10 and the "B" an eleven</font color=yellow></span hi>
Steve
Spot on, Steve.
<font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>
Incorrect, I'm afraid, Stuart.
<font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>