We look at the division of 151125 by 20 
The aim is to understand the frequency of 20 in 151125.

Let's proceed to step 1:
20 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 20

On to step 2:
When dividing 15 by 20, we get 0 with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 20

On to step 3:
20 can be fit into 151 7 times, resulting in a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtract 140 from 151 to get 11.
Include the next digit (1) from the dividend after 11, then repeat: 111 / 20

Let's proceed to step 4:
20 goes into 111 5 times with a remainder of 11.
Write down 5 as next digit of the result. 
Result so far: 75.0
Deduct 100 from 111 and we're left with 11.
Include the next digit (2) from the dividend after 11, then repeat: 112 / 20

Step 5:
112 divided by 20 is 5 with a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 755.0
Subtract 100 from 112 to get 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 20

Going ahead to step 6:
If we divide 125 by 20, we get 6 and a remainder of 5.
Record the quotient 6 as the next digit in the result. 
Result so far: 7556.0
Subtract 120 from 125 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 7:
20 can be fit into 50 2 times, resulting in a remainder of 10.
The next digit of our result is 2. 
Result so far: 7556.2
If we subtract 40 from 50, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
When dividing 100 by 20, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 7556.25
Subtract 100 from 100 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.

Going ahead to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7556.25
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.

On to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 7556.25
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 7556.25, with a leftover of 0.0.