The computer that can be able to solve more problems is B because it is one that can be able to implement subtract by carrying out a negation as well as an addition.
Why the above compter chosen?
Note that in the above case, Since both computers are able to implement all the same instructions, they are said to be able to solve the same number of problems but computer b is one that can do it better.
Computer B is one who is able to also subtract using negation and quickly followed by addition. So they can both handle the same amount of problems.
Therefore, The computer that can be able to solve more problems is B because it is one that can be able to implement subtract by carrying out a negation as well as an addition.
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