How much space will this copy fill

Set in 8 Point Bodoni Book

1 point leaded, 10 picas wide?

The copy contains 8 lines averaging 49 characters to the line. 8 x 49 = 392 characters.

The Linotype copy-fitting table shows you that 8 Point Bodoni Book, 10 picas wide, will average 32 characters to the line. Then 392 ÷ 32 12 lines.