retired_Sheree

I remember reading a few threads on maths questions and not having a clue what people were talking about, I’m really really stuck on two questions I wondered if anyone could help me, there must be an easy way to work it out I spent most of last night, I soooo don't get it.

This is about multiple fractions and factors, well the section it's in anyway here goes:

Sally is tiling a wall. The wall is 520cm long and 300cm high.

a) without wastage what is the largest size square tile that she can use?

b) tiles come in packs of 20. what is the minimum number of packs, that Sally needs to buy.

c) If sally buys the minimum number of packs, how many tiles will not be used.

That's it for that one, I can't work out the first one for the life of me, if anyone could help, and give a little bit on how the flip they managed it, that would be amazing.

Lastly because this is way over my head.

If 315=3x X 5y X 7z , find x,y and z

I mean what the hell is that all about lol, the little x,y and z are the little tiny squared symbol.

It's a long shot but if anyone can help, it would be a massive help to me, this has to be handed in tomorrow there they only two questions I can't understand.

retired_srini_aug1

300x300 i guess.


b. you dont say how big tiles are

c. as above.

retired_linton_justin

do the tiles come in varying sizes?

retired_srini_aug1

315=3x 5y 7z

You cant answer that, you need more information i.e. there are multiple answers for it

Also DYOFH

retired_Sheree

I thought 300by300 but I don't know if they meant more than one square tile that would cover as much as possible with the least amount of waste, 300by300 just seemed to easy an answer.

As for 315=3x 5y 7z that's all i got, i mean what is that all about, i spent most of last night trying to work it out..

retired_gulkis

300x300 i guess.

</BLOCKQUOTE>

so one big 3m squared tile?

a) you're trying to find the biggest number that will divide cleanly into both 520 and 300. just write down the factors for both numbers and find the biggest factor involved with both of them e.g. biggest factor for 8 and 20 would be 4 because it goes into both exactly.

b) you'll need the surface area of the wall and the surface area of the tile you found in part a for this one. rest is fairly obvious.

c) you're finding a remainder here. once you have the number of tiles needed and the number of packs needed it should be clear what to do.

i don't want to give the answers directly because i'm sure you could work it out with a bit of thought, plus i can't be arsed to do it myself.

retired_Sheree

a) I just got to 20, because 20 goes into 520 26 times and into 300 15 times, so twenty by twenty.

b) 156000cm is the area so 20x20 = 400 so 400 divided by 156000 is 390 tiles, then 400 divided by 20 = 20 so she'll need twenty packs.

c) minumum nuber of packs is 400 with 10 tiles waste, why do i keep thinking i've gone wrong.

retired_stephschmal

300x300 i guess.


b. you dont say how big tiles are

c. as above. </BLOCKQUOTE>

b) if she buys the pack with the 300 x 300 tiles, she'll only need to buy one pack.

c) she'll need two of the tiles from the pack in (b), so that leaves her with 18 unused tiles (20-2=18)

x, y and z is 2, written in a tinier font than the rest of the equation. Tell your teacher that the equation is wrong, BTW.

retired_linton_justin

if x=3 and y&z= 1 then it works....

retired_Angela Adams

300x300 i guess.


b. you dont say how big tiles are

c. as above. </BLOCKQUOTE>