The surface area of the cuboid is 400 cm less than the sum of the three cuboids

Three same cube blocks are put together to form a cuboid, and the number of reduced faces is
(3-1) × 2 = 4
What is the area of each face of a cube
400 △ 4 = 100 (square centimeter)
Because 10 × 10 = 100
So the edge length of a cube is 10 cm
What is the volume of a cuboid
10 × 10 × 10 × 3 = 3000 (cm3)

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