1、

Total score of three times =(93+2)×3=285 (points)

Total score of the first two items =93×2= 186 (points)

The third score =285- 186=99 (points)

2、

Saw into three sections, the surface area increased by (3- 1)×2=4 bottom areas.

therefore

Bottom area = 18÷4=4.5 (square decimeter)

3 meters =30 decimeters

The original volume of this wood =4.5×30= 135 (cubic decimeter).