We divide 779142 by 15
The aim is to understand the frequency of 15 in 779142.

Going ahead to step 1:
When dividing 7 by 15, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 15

Going ahead to step 2:
77 divided by 15 is 5 with a remainder of 2.
The next digit of our result is 5. 
Result so far: 5.0
If we take 75 away from 77, we end up with 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 15

Moving on to step 3:
29 divided by 15 is 1 with a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 51.0
If we take 15 away from 29, we end up with 14.
Append the next digit (1) from the dividend to 14 and continue with: 141 / 15

On to step 4:
If we divide 141 by 15, we get 9 and a remainder of 6.
The next digit of our result is 9. 
Result so far: 519.0
Subtract 135 from 141 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 15

Moving on to step 5:
15 can be fit into 64 4 times, resulting in a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 5194.0
If we take 60 away from 64, we end up with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 15

On to step 6:
When dividing 42 by 15, we get 2 with a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 51942.0
Subtracting 30 from 42 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 7:
15 can be fit into 120 8 times, resulting in a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 51942.8
Subtracting 120 from 120 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.

Going ahead to step 8:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 51942.8
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.

Advancing to step 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 51942.8
Subtracting 0 from 0 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.

After the division, we end up with 51942.8 and a remainder of 0.0.