If a water tank needs one litre paint for every 16 metre square, how much paint is required for painting the outer surface of the tank 12 x 4 x 3 m?

Assuming the tank is a closed rectangular box, its total surface area is given by 2 * (lb + bh + lh) = 2 * (12*4 + 4*3 + 12*3) = 2 * (48 + 12 + 36) = 192 m^2. Since one litre of paint covers 16 m^2, the required amount of paint is 192 / 16 = 12 litres. (If the tank is open at the top, the area is 144 m^2, requiring 9 litres, but the provided options indicate a closed tank was intended). The required paint is 12 litres.

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