Not so Simple Aritmetic or is it

Saw this on another forum and the debate on the correct answer was interesting to me. No idea where it was originally was from. I thought I'd bring it here to see what the smart crowd does with it. Two possible answers - 15 or 60 which is correct.

My take on which answer is correct:

I believe 15 is correct based on PEMDAS but the way I was taught in grade school the answer would be 60 but then in those days printing was the new thing.

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