We look at the division of 138475 by 20 
The aim is to understand the frequency of 20 in 138475.

Going ahead to step 1:
1 divided by 20 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 20

Going ahead to step 2:
If we divide 13 by 20, we get 0 and a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 20

Moving on to step 3:
138 divided by 20 is 6 with a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtract 120 from 138 to get 18.
Append the next digit (4) from the dividend to 18 and continue with: 184 / 20

Moving on to step 4:
If we divide 184 by 20, we get 9 and a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 69.0
Subtract 180 from 184 to get 4.
Bring next digit (7) of the dividend behind the 4 and repeat the process: 47 / 20

Advancing to step 5:
When dividing 47 by 20, we get 2 with a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 692.0
The remainder is 7 after subtracting 40 from 47.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 20

Going ahead to step 6:
When dividing 75 by 20, we get 3 with a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 6923.0
The remainder is 15 after subtracting 60 from 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
150 divided by 20 is 7 with a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 6923.7
Subtract 140 from 150 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.

On to step 8:
20 goes into 100 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 6923.75
If we subtract 100 from 100, 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.

Going ahead to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 6923.75
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.

Step 10:
0 divided by 20 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 6923.75
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.

The final outcome is 6923.75, with a leftover of 0.0.