Book II. Briefly summarised it.

6 160 ■9 E 60+60=120 18+13VJ-311/* 6 189 69 42+27 D 60+ 60=120 G0+60=120 60+ 60=120 14+7=21 8 168 48 2x24 D 60+60=120 16+16=32 7Vj 240 120 4x30 E 60+ 60=120 60+60=120 60+ 60=120 9+221/j=311/, 216 96 4X24 240 10x24 Variant 3: Productivity of.