The height of a meeting room that's measures 19 m by 12 m is 3 m. Glen plans to apply 2 coats of paint to the walls of the room. A 4 L can of paint covers about 30m

What is the surface area of the walls to be painted? How many cans of paint will Glen need?

So this meeting room is 3 by 19 by 12

surface area/wall area=2 (height times width) + 2 (height times depth) + 2 (width times depth)

lets say 3=height

depth=19

width=12

2 (3 times 12) + 2 (3 times 19) + 2 (12 times19) = 2 (36) + 2 (57) + 2 (228) = 72+114+456=642

2 coats of paint so surface area times 2

642 times 2=1284

assuming 30m means 30 square meters we divide 1284 by 30 and get

1284/30=42 and 4/5 or 42.8

then find how many cans by dividing by 4

42.8/4=10 and 1.4/2=10.7, but you cant buy 0.7 of a can so round up and get

11 cans of paint

he needs 11 cans of paint