Answer:
28
Explanation:
the sum means it is addition and difference means subtraction.
this means that if you add the difference of 10 and 2 to 20 you will get the answer.
10-2 equals to 8
then do 20+8 to get 28
The answer would be 28.
Cuz, 10-2=8
8+20=28
So the answer is 28, Hope this helps:)
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