Cut a 3.5 decimeter cuboid wood into 6 sections on average. The surface area is 125 square centimeter more than the original. Calculate the original volume of this section of wood

Cut a 3.5 decimeter cuboid wood into 6 sections on average. The surface area is 125 square centimeter more than the original. Calculate the original volume of this section of wood

125/5=25
25/2=12.5
12.5 * 3.5 * 10 = 437.5 cm3