Area of 4 walls of a cuboid 400 sq cm, its length is 15 cm and height is 8 cm. What is its breadth (in cm)?
Area of 4 walls of a cuboid 400 sq cm
$$\Rightarrow 2(bh+hl) = 400$$
$$\Rightarrow (bh+hl) = 200$$
$$\Rightarrow$$ (bx8+15x8) = 200
$$\Rightarrow$$ 8xb = 200-120=80
$$\Rightarrow b = 10$$
so the answer is option D.
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