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 ..
this is why u go to school and pay attention in class.





find the total surface area


find cost of first layer


find cost of second layer


add costs togetherThe first coat of paint for the outside walls of a building requires 1 liter of paint for each 10 m squared ..
total area to be painted = 2(20x6) + 2(15x6) = 2(120) + 2(90) = 240+180 = 420 sq m





first coat = 420/10 = 42 liters


2nd coat = 420/15 = 28





total liters of paint = 70


cost = 70 x 3.5 = 245
(20*6)*2+(15*6)*2= 240+ 180= 420 surface to cover


420/10+420/15=42+28=70 Liters of paint needed


70*3.50=$245