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Occam's razor says the simplest explanation is the best.

The "arrows" can be decoded in a simple and consistent way:
- Black means addition, white means multiplication.
- The number of sides of the arrowhead indicates by how much.
In the process you find A = 60, B = 252 and A+B = 312. Just as you did. It is not even difficult to find.

But your source says it is wrong.

There are different possibilities.
- Either this solution works just by chance and there is another better explanation,
- the solution is correct and your source is mistaken.
- there is a typo in the problem statement.

To me it is clear that the 1st possibility is such an extraordinary coincidence that the truth must be in the last 2 explanations.

Among these explanations, it seems more likely that there is an error in the formatting of the problem statement rather than in the transcription of the answer the source refers to.

So my (updated) conclusion is: it is an error in the problem statement.

For example, it is possible the last arrow was meant to have a triangular head. We have enough information to understand that it should mean "times 3". And the solution would be A=60, B=3x63=189, A+B=249.

Occam's razor says the simplest explanation is the best.

The "arrows" can be decoded in a simple and consistent way:
- Black means addition, white means multiplication.
- The number of vertices of the arrowhead seen as a polygon indicates by how much.
In the process you find A = 60, B = 252 and A+B = 312. Just as you did. It is not even difficult to find.

But your source says it is wrong.

There are different possibilities.
- Either this solution works just by chance and there is another better explanation,
- the solution is correct and your source is mistaken.
- there is a typo in the problem statement.

To me it is clear that the 1st possibility is such an extraordinary coincidence that the truth must be in the last 2 explanations.

Among these explanations, it seems more likely that there is an error in the formatting of the problem statement rather than in the transcription of the answer the source refers to.

So my (updated) conclusion is: it is an error in the problem statement.

For example, it is possible the last arrow was meant to have a triangular head. We have enough information to understand that it should mean "times 3". And the solution would be A=60, B=3x63=189, A+B=249.

Occam's razor says the simplest explanation is the best.

The "arrows" can be decoded in a simple and consistent way:
- Black means addition, white means multiplication.
- The number of sides of the arrow head indicate by how much.
In the process you find A = 60, B = 252 and A+B = 312. Just as you did. It is not even difficult to find.

But your source says it is wrong.

There are different possibilities.
- Either this solution works just by chance and there is another better explanation,
- the solution is correct and your source is mistaken.
- there is a typo in the problem statement.

To me it is clear that the 1st possibility is such an extraordinary coincidence that the truth must be in the last 2 explanations.

Among these explanations, it seems more likely that there is an error in the formatting of the problem statement rather than in the transcription of the answer the source refers to.

So my (updated) conclusion is: it is an error in the problem statement.

For example, it is possible the last arrow was meant to have a triangular head. We have enough information to understand that it should mean "times 3". And the solution would be A=60, B=3x63=189, A+B=249.

Occam's razor says the simplest explanation is the best.

The "arrows" can be decoded in a simple and consistent way:
- Black means addition, white means multiplication.
- The number of sides of the arrowhead indicates by how much.
In the process you find A = 60, B = 252 and A+B = 312. Just as you did. It is not even difficult to find.

But your source says it is wrong.

There are different possibilities.
- Either this solution works just by chance and there is another better explanation,
- the solution is correct and your source is mistaken.
- there is a typo in the problem statement.

To me it is clear that the 1st possibility is such an extraordinary coincidence that the truth must be in the last 2 explanations.

Among these explanations, it seems more likely that there is an error in the formatting of the problem statement rather than in the transcription of the answer the source refers to.

So my (updated) conclusion is: it is an error in the problem statement.

For example, it is possible the last arrow was meant to have a triangular head. We have enough information to understand that it should mean "times 3". And the solution would be A=60, B=3x63=189, A+B=249.

Occam's razor says the simplest explanation is the best.

The "arrows" can be decoded in a simple and consistent way:
- Black means addition, white means multiplication.
- The number of sides of the arrow head indicate by how much.
In the process you find A = 60, B = 252 and A+B = 312. Just as you did. It is not even difficult to find.

But your source says it is wrong.

There are 2 possibilities.
- Either this solution works just by chance and there is another better explanation,
- or the solution is correct and your source is mistaken.

To me it is clear that the 1st possibility is such an extraordinary coincidence that the 2nd possibility is probably the correct one.
I don't want to claim boldly that your source is wrong, but if I had to bet on it, that is where I would put my money.

Or another possibility

There is another solution but the coincidence is intentional, it is a trap to make you look stupid. That happens. (edit: maybe not on an official exam) If so, shame on the designer.

Occam's razor says the simplest explanation is the best.

The "arrows" can be decoded in a simple and consistent way:
- Black means addition, white means multiplication.
- The number of sides of the arrow head indicate by how much.
In the process you find A = 60, B = 252 and A+B = 312. Just as you did. It is not even difficult to find.

But your source says it is wrong.

There are different possibilities.
- Either this solution works just by chance and there is another better explanation,
- the solution is correct and your source is mistaken.
- there is a typo in the problem statement.

To me it is clear that the 1st possibility is such an extraordinary coincidence that the truth must be in the last 2 explanations. 

Among these explanations, it seems more likely that there is an error in the formatting of the problem statement rather than in the transcription of the answer the source refers to.

So my (updated) conclusion is: it is an error in the problem statement.

For example, it is possible the last arrow was meant to have a triangular head. We have enough information to understand that it should mean "times 3". And the solution would be A=60, B=3x63=189, A+B=249.