The answer is 91
6 U/ d- h4 j& N( r. S& F" P1 row 3x4+1x3=15
, H1 I! a, s i$ Q" G5 u: Ktvb now,tvbnow,bttvb2 row 4x5+2x4=28tvb now,tvbnow,bttvb9 \, a8 n& h. _! a) O
3 row 5x6+3x5=45) w/ S% R% [% `
4 row 6x7+4x6=66tvb now,tvbnow,bttvb7 ^2 y% b2 j: C! `7 B+ ^, T& ^
5 row 7x8+5x7=91 |