The first coat of paint for the outside walls of a building requires 1 liter of paint for each 10 m squared ..

of wall surface. The second coat requires 1 liter for every 15 m squared. If paint costs $3.50 per liter, what will be the cost of two coats of paint for the four outside walls of a building 20 m long, 15m wide, and 6 m high? Can you please break it down for me so I can understand it.The first coat of paint for the outside walls of a building requires 1 liter of paint for each 10 m squared ..
Outside area of building's walls = 2wh + 2lh = 2h(w + l)





= 2(6)(15 + 20) = 12(35)





= 420 m^2





Liters of paint required by first coat:





(1 L/10 m^2) * 420 m^2 = 42 Liters





Liters of paint required by second coat:





(1 L/15 m^2) * 420 m^2 = 28 Liters





Total Volume of paint required = 42 + 28 = 70 Liters





Total Cost of Paint: 70 Liters * ($3.5/Liter) = $245The first coat of paint for the outside walls of a building requires 1 liter of paint for each 10 m squared ..
$19