47-27-20

To solve the expression 47-27-20, we need to perform subtraction from left to right.

First, calculate 47-27, which equals 20.

Next, subtract 20 from the result of the first subtraction: 20-20 equals 0.

Therefore, the final answer to 47-27-20 is 0.

I hope this explanation helps you understand how to solve this subtraction problem. If you have any more questions or need further assistance, feel free to ask!