B.747-400
Four tanks in each wing;
Left wing from root to tip: No2, No1, Reserve No2, Left Surge
Right wing from root to tip: No3, No4, Reserve No3, Right Surge
One tank between the wings:
Centre Wing Tank
Optional extra: One Tank in the Horizontal Stabiliser (actually two tanks, i.e. one in each tail plane, but treated as one tank:
Stabiliser Tank
So, ten tanks in all, or nine if the Stab Tank is not fitted.