Question

A open tank is 3m long,and 2m wide and 1m 50cm deep.find the amount of paint required to paint its inside and outside ,if 1kg of paint covers 20square meters.(neglect the thickness of the material.​

Answer 1

Answer:

total surface area of tank = 2[2(lb + bh + hl) - lb]

= 2[2(3*2 + 2*1.5 + 3*1.5) - 3*2]

= 2[2(6 + 3 + 4.5) - 6] = 2[2(13.5) - 6]

= 2[27 - 6] = 42 m²

amount of paint required = 42/20 = 2.1 kg

therefore 2.1 kg paint is required

Answer 2

Answer:

WE NEGLECT ONE LB BECAUSE UPPER SURFACE IS OPEN. HENCE THE AMOUNT REQUIRED =1.05KG