SOLUTION: 1a.Calculate the total area of the walls of a hospital ward 5m long, 4m wide and 21/2m high. (do not allow for doors and windows). 1b.one litre of paints covers 15 metres square.

Algebra ->  Surface-area -> SOLUTION: 1a.Calculate the total area of the walls of a hospital ward 5m long, 4m wide and 21/2m high. (do not allow for doors and windows). 1b.one litre of paints covers 15 metres square.       Log On


   

Question 1082366: 1a.Calculate the total area of the walls of a hospital ward 5m long, 4m wide and 21/2m high. (do not allow for doors and windows).
1b.one litre of paints covers 15 metres square. How many litres of paint will be needed to the paint the inside walls of the ward in question 1a above.
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
the ward is 5 meters long and 4 meters wide and 21/2 meters high.
there are 4 walls to paint.

2 of the walls will be 5 meters long by 21/2 meters high.
2 of the walls will be 4 meters long by 21/2 meters high.

2 * 5 * 21/2 = 210/2 square meters.
2 * 4 * 21/2 = 168/2 square meters.

total surface to be painted = (210 + 168) / 2 square meters.
simplify this to get total surface to be painted = 189 square meters.

one liter of paint covers 15 square meters.
189 / 15 = 12.6 liters of paint required to paint the walls.

if the paint comes in 1 liter containers, then you would need to purchase 13 containers in order to have 12.6 liters of paint available.
once you are finished, you would have .4 liters of paint left.

.4 liters of paint would be enough to cover another .4 * 15 = 6 square meters of surface.

your solution should be that you require 12.6 liter of paint.