Sorry AkiB, I completely misunderstood your original post--I thought you were talking about the scaled verbal and quant scores, not the number of questions you got correct. Oops. File under: internet before coffee.
Please disregard my last post, unless you really want to look at GMAT scoring charts just for the fun of it. Brent is absolutely correct: GMAT scores are based on which questions you miss, not necessarily how many. You can miss a crapload of questions and do incredibly well, and you can miss relatively few questions and get a disappointing score. But it's impossible to translate your raw results into a composite GMAT score, unfortunately.
Sorry for the confusion!