20 apples you take the total number of Jimmy’s apple in this case it’s 40 and you take Karl’s total amount of apples 20 and subtract 40 from 20
40-20
Since 0 minus 0 is still 0 you put a 0 on the right side right below the question. Then you subtract 4 from 2 which equals out to 2. Your total answer is going to be 40.