you are casting an the result of integer division to a double.

You need to cast each part of the division to double BEFORE the result.

double pages = (double)total/(double)perPage;

The rest should work

Math.ceil() returns the ceiled value. It can't change the value of the variable it takes as argument, because Java passes arguments by value. So you need to do

hours = Math.ceil(hours);

This is probably because when you divide an Integer by an Integer you get an Integer back which has the same value as Decimal.round(RoundingMode.DOWN).

system.assertEquals(1, 8/5);
system.assertEquals(8/5, (8.0/5).round(RoundingMode.DOWN);

system.assertEquals(-1, -8/5);
system.assertEquals(-8/5, (-8.0/5).round(RoundingMode.DOWN);

system.assertEquals(2, 7/3);
system.assertEquals(7/3, (7.0/3).round(RoundingMode.DOWN);

If you know you have Integers and you want to get their ceiling, you could do something like:

public static Integer ceiling(Integer x, Integer y)
{
    return Math.ceil(Decimal.valueOf(x).divide(y, /*digits*/ 1));
}

You are doing 157/32 which is dividing two integers with each other, which always result in a rounded down integer. Therefore the (int) Math.ceil(...) isn't doing anything. There are three possible solutions to achieve what you want. I recommend using either option 1 or option 2. Please do NOT use option 0.

Option 0

Convert a and b to a double, and you can use the division and Math.ceil as you wanted it to work. However I strongly discourage the use of this approach, because double division can be imprecise. To read more about imprecision of doubles see this question.

int n = (int) Math.ceil((double) a / b));

Option 1

int n = a / b + ((a % b == 0) ? 0 : 1); 

You do a / b with always floor if a and b are both integers. Then you have an inline if-statement which checks whether or not you should ceil instead of floor. So +1 or +0, if there is a remainder with the division you need +1. a % b == 0 checks for the remainder.

Option 2

This option is very short, but maybe for some less intuitive. I think this less intuitive approach would be faster than the double division and comparison approach:
Please note that this doesn't work for b < 0.

int n = (a + b - 1) / b;

To reduce the chance of overflow you could use the following. However please note that it doesn't work for a = 0 and b < 1.

int n = (a - 1) / b + 1;

Explanation behind the "less intuitive approach"

Since dividing two integers in Java (and most other programming languages) will always floor the result. So:

int a, b;
int result = a/b (is the same as floor(a/b) )

But we don't want floor(a/b), but ceil(a/b), and using the definitions and plots from Wikipedia:

With these plots of the floor and ceil functions, you can see the relationship.

You can see that floor(x) <= ceil(x). We need floor(x + s) = ceil(x). So we need to find s. If we take 1/2 <= s < 1 it will be just right (try some numbers and you will see it does, I find it hard myself to prove this). And 1/2 <= (b-1) / b < 1, so

ceil(a/b) = floor(a/b + s)
          = floor(a/b + (b-1)/b)
          = floor( (a+b-1)/b) )

This is not a real proof, but I hope you're satisfied with it. If someone can explain it better I would appreciate it too. Maybe ask it on MathOverflow.

code is absolutely fine but the thing is there was some issue with android studio it was executing my previous code in background which had math.round method....now i have cleaned the project and uninstalled and reinstalled the app ...now its working fine as intended.

You need to change this:

num = Math.ceil(num);

What's happening is you are not assigning the value from Math.ceil(num) to anything.

you have to cast it first

 double c=Math.ceil((double)d/b);