Question

Here a subtraction problem that has been solved incorrectly 21-9=11 what answer I got b 11+9=20​

Answer 1

The Answer:

21 - 9 = 12, not 11.

Step-by-step explanation:

It is not much else to say here, so straightforward, the answer lies above.

Therefore,

you are correct. 11 + 9 = 20 - 9 = 11, which is correct for the given equation.