We look at the division of 72501 by 20 
The aim is to understand the frequency of 20 in 72501.

On to step 1:
7 divided by 20 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 20

Step 2:
72 divided by 20 is 3 with a remainder of 12.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 60 from 72 and we're left with 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 20

Going ahead to step 3:
20 can be fit into 125 6 times, resulting in a remainder of 5.
Use 6 as the next digit of our solution. 
Result so far: 36.0
Deduct 120 from 125 and we're left with 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 20

Advancing to step 4:
20 goes into 50 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 362.0
Deduct 40 from 50 and we're left with 10.
Include the next digit (1) from the dividend after 10, then repeat: 101 / 20

On to step 5:
101 divided by 20 is 5 with a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 3625.0
If we take 100 away from 101, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 6:
When dividing 10 by 20, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 3625.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 7:
When dividing 100 by 20, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 3625.05
The remainder is 0 after subtracting 100 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 3625.05
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 3625.05
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 3625.05 and a remainder of 0.0.