what is the repeated substraction of 12515

Here, we have to find the repeated subtraction of $125÷15$.

Step 1:
  Subtract 15            $125-15=110$
  Subtract 15 again   $110-15=95$
  Subtract 15 again  $95-15=80$
  Subtract 15  again     $80-15=65$
  Subtract 15 again  $65-15=50$
  Subtract 15 again     $50-15=35$
  Subtract 15 again    $35-15=20$
  Subtract 15 again  $20-15=5$
Here we can't subtract 15 from 5 to leave a whole number. So 5 is remainder.

Step 2: Count the number of times we have subtracted 15. Here we have subtracted 8 times with remainder of 5.

So, $125÷15$ = 8 remainder 2