SOLUTION: Could you explain this to me?: How many liters of paint are needed to paint the walls of a rectangular prism-shaped room that is 6m x 4m x 2.5m if 1 L of paint covers 20 m2? (a

Algebra ->  Absolute-value -> SOLUTION: Could you explain this to me?: How many liters of paint are needed to paint the walls of a rectangular prism-shaped room that is 6m x 4m x 2.5m if 1 L of paint covers 20 m2? (a      Log On


   

Question 33578: Could you explain this to me?:
How many liters of paint are needed to paint the walls of a rectangular prism-shaped room that is 6m x 4m x 2.5m if 1 L of paint covers 20 m2? (assume there are no doors or windows)
Thanks!
Answer by Cintchr(481) About Me  (Show Source):
You can put this solution on YOUR website!
With a room of the l, w, and h of 6m, 4m, 2.5m you have four walls
Two walls are 6 x 4
Two walls are 6 x 2.5
First find the total area
+W1+%2B+W2+%2B+W3+%2B+W4+=+AREA+
+%286%2A4%29+%2B+%286%2A4%29+%2B+%286%2A2.5%29+%2B+%286%2A2.5%29+=+AREA+
+2%286%2A4%29+%2B+2%286%2A2.5%29+=+AREA+
+2%2824%29+%2B+2%2815%29+=+AREA+
+48+%2B+30+=+AREA+
+78+=+AREA+

Now, knowing that l Ltr of paint covers 20 sq metres .... divide

+78%2F20+=+3.9+
But since you cant buy .9 of a can of paint, you will need to buy 4 FULL cans.