Cut a 2-decimeter-long rectangular block into two sections and increase its surface area by 4 square centimeters. What is the volume of the rectangular block?

Cut a 2-decimeter-long rectangular block into two sections and increase its surface area by 4 square centimeters. What is the volume of the rectangular block?

4 △ 2 = 2 square centimeter
2 decimeters = 20 cm
2 times 20 = 40 cubic centimeter