https://preparationpoint.info/spsc-past-papers/combined-competitive-examination-paper-2019-mcqs-spsc/a-student-obtained-20-of-marks-and-failed-by-50-marks-from-passing-marks-another-student-obtained-40-marks-and-get-30-marks-more-than-the-passing-marks-find-the-total-marks-in-the-exam/