15551 divided by 20 
We want to figure out the number of times 15551 can be divided by 20.

Going ahead to step 1:
If we divide 1 by 20, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 20

Step 2:
20 goes into 15 0 times with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Take the next digit (5) from the dividend and append it to 15, then repeat: 155 / 20

On to step 3:
20 goes into 155 7 times with a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtracting 140 from 155 leaves us with 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 20

Advancing to step 4:
If we divide 155 by 20, we get 7 and a remainder of 15.
Put 7 as the next digit of the answer. 
Result so far: 77.0
If we subtract 140 from 155, we get 15.
Include the next digit (1) from the dividend after 15, then repeat: 151 / 20

Step 5:
If we divide 151 by 20, we get 7 and a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 777.0
If we subtract 140 from 151, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 6:
110 divided by 20 is 5 with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 777.5
If we take 100 away from 110, we end up 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.

Advancing to step 7:
100 divided by 20 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 777.55
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.

The quotient of the division is 777.55, and the remainder is 0.0.