The answer is 91
9 p' ~9 h4 |6 v7 m& y4 K! ntvb now,tvbnow,bttvb1 row 3x4+1x3=15% v; y/ U) o: c8 U' t8 F
2 row 4x5+2x4=28tvb now,tvbnow,bttvb# P4 R$ u& v$ U* n4 X
3 row 5x6+3x5=45公仔箱論壇0 n. h4 e4 M0 k9 z$ ]& r7 V! b
4 row 6x7+4x6=66
7 Q- Y% ?7 M' m" n2 I8 L3 btvboxnow.com5 row 7x8+5x7=91  |