148539 divided by 20 
The aim is to understand the frequency of 20 in 148539.

Advancing to step 1:
If we divide 1 by 20, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 20

Moving on to step 2:
20 goes into 14 0 times with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 14 to get 14.
Append the next digit (8) from the dividend to 14 and continue with: 148 / 20

Step 3:
If we divide 148 by 20, we get 7 and a remainder of 8.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 140 from 148 and we're left with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 20

Moving on to step 4:
The number 20 fits into 85 4 times, leaving a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 74.0
Deduct 80 from 85 and we're left with 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 20

Moving on to step 5:
When dividing 53 by 20, we get 2 with a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 742.0
Subtracting 40 from 53 leaves us with 13.
Take the next digit (9) from the dividend and append it to 13, then repeat: 139 / 20

Moving on to step 6:
If we divide 139 by 20, we get 6 and a remainder of 19.
Put 6 as the next digit of the answer. 
Result so far: 7426.0
Subtract 120 from 139 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
The number 20 fits into 190 9 times, leaving a remainder of 10.
Write down 9 as next digit of the result. 
Result so far: 7426.9
Subtract 180 from 190 to 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.

Let's proceed to step 8:
100 divided by 20 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 7426.95
Subtracting 100 from 100 leaves us 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.

Step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 7426.95
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.

Going ahead to step 10:
If we divide 0 by 20, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 7426.95
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.

The final result is 7426.95 with a remainder of 0.0.