If 70 millilitre of paint is required for printing a surface area 100m^2, how much paint is needed for painting a closed cylindrical drum with radius 5m , and height 21 m ?

• 572 ml.
  
  Per sq. m. paint needed=70/100=7/10 ml.
  Total surface area of Closed cylinder=2*Pi*r*(r+h)=2*(22/7)*5*(5+21)=5720/7 m^2
  So total paint needed=(7/10)*(5720/7)=572 ml.
• 8 years agoHelpfull: Yes(2) No(1)