Reading RTL is way much different from writing an LTR language RTL, which basically means that the text render-er (or the person) is not doing its (their) job properly to display the text correctly. So, in the countries where they read RTL, they read the RTL language RTL, not English in RTL, because English is an LTR language.
Some of RTL languages are Persian, Urdu, Dari, Hebrew, Arabic, etc. and if you really want to know which one they look like more, the answer is 1. However in some of these languages, like Persian, math and numbers are done LTR, just like English. So arithmetic are done LTR, and 67 is just 67, not "76". I won't judge about the other languages, since I do know that some of these rules change in Arabic for instance.
Also, I would recommend reading some articles or even try learning these languages to even a small extent, if you really want to understand how these languages work, since the whole answer cannot fit in one single post here. (: