What is the answer to 30-10?

The problem asks for the result of subtracting 10 from 30. To find this, you start with the number 30 and then need to take away 10.

When you perform the subtraction of 10 from 30, you can visualize it as counting backward from 30. Starting at 30, if you remove 10, you count down to 29 (removing 1), then to 28 (removing 2), and so on, until you reach 20 after subtracting 10 in total.

Thus, the correct answer is indeed 20. This is a straightforward arithmetic operation that is foundational in mathematics, often forming the basis for more complex calculations.