10. An open tank is 3 m long, 2 m wide and 1 m 50 cm deep. Find the amount of paint required to paint its
inside and outside, if 1 kg of paint covers 20 square metres. (Neglect the thickness of the material)
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Answer:
Step-by-step explanation:
height = 3m width = 2 m depth = 1 m 50cm = 1.5 m
Total surface area of tank = 2 (lb + bh + hl) = 2( 3 x 2 + 2 x 1.5 + 1.5 x 3)
= 2 x 13.5 = 27 m^2
1 kg paint = 20 m^2
so 27 m^2 = 27 x 1 / 20 = 1.35kg of paint
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