Please Help Me With My Math Problems?

Question

Solid brick construction involves a double layer of bricks with an air space in between. Every 6th row has one brick set long ways and the next set across so that it joins the other wall. If each brick is 270 mm long, 30 mm high, 20 mm wide and each mortared section is 9 mm wide, how many bricks must be purchased to build a wall 10 m high and 10 m long?

Answer 1

Ok so I'm really confused about how this whole brick wall is set up.  I do better if I can see a picture.  But I will still try to help.  

First, lets convert everything into the same units, which will be mm.  

So 10 m=10,000mm

And if you want your wall to be 10,000 mm long, and each brick is 270 mm long...then you can use this equation...and x will be the number of bricks you need.

270x = 10,000

x= 37.04 and we will just say 38 bricks.  

And then we will use this equation to see how many bricks we need to make is 10,000mm high.  X = # of bricks.

30x = 10,000

x = 333.33 = 334 bricks.  

Ok so now we know it has to be 38 bricks long and 334 bricks high.  

So we will multiply those two numbers together to find out how many bricks we need..

38 * 334 = 12,692 bricks

and since the problem said the wall consists of a double layer of bricks, then we will multiply the last answer by 2.

so... 12,692*2 = 25,384 bricks. This is your final answer.

I'm not 100% sure if this is right...but I think it is.  

I think the question just gives a lot of extra information that is not needed.  

I hope this helps.  

Answer 2

see above