consider the following two problems from Princeton's Quant GRE prep
[problem 1](https://i.stack.imgur.com/ZjDs7.png)
[problem 2](https://i.stack.imgur.com/rbSLY.png)

Why am i meant to assume that a/b/c should be read as a/(b/c)? I would assume it should be read as a ÷ b ÷ c, and therefore (a ÷ b) ÷ c, considering that the same operations are performed left to right.

Furthermore my answer to question 1 was identical to the question. Could this be a problem with the way my browser displays the questions? 

Is Princeton correct in asserting that a/b/c should be assumed to state a/(b/c)?

Sorry about such a pedestrian question, I've been having trouble finding someone to answer it and my exam is tomorrow.