The answer is 91
# U1 |. [' ^ |, }& q8 @tvboxnow.com1 row 3x4+1x3=15
' g% d; G0 @+ s0 F3 H7 D+ h; Otvb now,tvbnow,bttvb2 row 4x5+2x4=28tvboxnow.com% {5 t# n8 H9 i* m. _; r
3 row 5x6+3x5=45
# p* n# ]9 `, e7 u' m |$ C4 row 6x7+4x6=66, M! B6 q) Y m Q2 S: C1 X
5 row 7x8+5x7=91  |