Depends on culture and level of education. For someone who comes from a culture where we use decimals, I’d interpret this in the math/physics class way, i.e. 10.

Might be. I’ve never seen it used that way, though, I know that some people prefer parentheses around the fraction to the right of integers.

That said, even Wolframalpha appears to disagree, which I find mildly funny if what you say is true.

EDIT: Just realized something even more damning. If you input it into Wolframalpha using math input, it just assumes addition. Yeah, I might have to read up on this.