Saw a 5 meter long cuboid wood into three sections, the surface area increased by 160 square centimeters, the volume of this wood is () cubic decimeter?

Saw a 5 meter long cuboid wood into three sections, the surface area increased by 160 square centimeters, the volume of this wood is () cubic decimeter?

When the cuboid wood is sawed into three sections, the surface area increases by (3-1) × 2 = 4 bottom areas
therefore
Bottom area = 160 △ 4 = 40 (square centimeter) = 0.4 (square decimeter)
5m = 50m
Volume of wood = 0.4 × 50 = 20 (cubic decimeter)

A cuboid wood is 1.5 meters long. When the wood is sawed into two sections, the surface area increases by 32 square decimeters. What is the volume of the original wood?

1.5m = 15m
32 △ 2 × 15 = 240 (cubic decimeter) volume

Saw a 1.5 meter long cuboid wood into two sections, the surface area increased by 2.4 square decimeters

2.4 △ 2 × 1.5 × 10 = 18 (cubic decimeter)