Question

18) A rectangular piece of cardboard of dimensions 42 cm x 32 cm is used to make a box. Squares of size 6 cmx 6 cm are cut out from all four corners (see figure). The remaining portion is folded to make a box. The inner surfaces of the box are painted. Find the total area of the painted the painted surface.
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Answer 1

Answer:

42×32÷6×6=37.3 is answer