Calculating the expression:
0.77 x 6.5 x 12.4 ÷ 3.1 x 0.7 x 1.3
= 60.73
Therefore, the result of the expression is 60.73.
Calculating the expression:
0.77 x 6.5 x 12.4 ÷ 3.1 x 0.7 x 1.3
= 60.73
Therefore, the result of the expression is 60.73.