50 marks in VITEEE 2021 Exam means approximately 50000 but it is hard to predict as the cutoffs change every year and depend on a lot of factors like the difficulty of exam and how many students gave the exam.You can refer to the previous year cutoff trends for the VITEEE exam to get an idea about the ranks-
https://engineering.careers360.com/articles/viteee-cutoff
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile