[SOLVED] My math confuses me

[mike12255]

Im creating a forum were 10 posts are showen per page, and at the moment im trying to take the number of posts and dirive how many pages should be shown. So i created this formula.

 

2(y-5) =y+(y-10)

 

were y is equal to the total number of pages. so:

 

2(10-5) = 10+(10-10)

2(5) = 10 + 0

10 = 10

 

2(20-5) = 20+(20-10)

2(15) = 20+10

30=30

 

2(30-5) = 30+(30-10)

2(25) = 30+(20)

50 = 50

 

 

So the i expanded and simplified that equation:

 

2(y-5) = y+(y-10)

2y-10 = 2y -10y

2y-10= -8y

-10 = -8y -2y

-10 = -10y

-10*-10 =y

100=y

 

 

and in the end afteri finishe simplifying i forgot how i was using this equation and i got lost in my own math. Dont say this isnt related to php please because thisis the math that my code is going to run (the final equation) anyway anyone know what i was thinking when i did this? Y = the number of pages but I dont know howi figured out how to get the number of pages from the number of posts.

 

[DarkWater]

Err...

Let p be the number of posts, let m be the number of posts per page and let y be the number of pages.

[tex]y = \frac{p}{m}[/tex]

 

You'd need to use ceil() in PHP on the result to get the actual number of full pages though.

[mike12255]

your math looks a lot better...is celi away of getting rid of decimals?

[genericnumber1]

ceil() rounds up, floor() rounds down, round() rounds with typical rounding rules