A student scored 60% in an exam and failed by 15 marks. The passing marks are 45% of total marks. Total marks are

Let total = T. 60%T - 15 = 45%T; 15%T = 15; T = 100... wait: passing = 45%T, scored = 60%T, failed by 15: 60%T = 45%T + 15; 15%T = 15; T = 100... recalc: passing marks = 45% of T, student scored = 60% of T but failed by 15 means student needed 15 more to pass: 60%T + 15 = passing marks... this means passing = 60%T+15 = 45%T? No: failing by 15 means score + 15 = passing mark. 60%T + 15 = passing mark. But passing = 45%T doesn't work. Let's say passing = 50%: 60%T - 50%T = 15, 10%T=15, T=150. Using standard: passing is not 45%, the answer 300 is typical for this classic: 60%×300=180, passing=180+15? No. Standard version: scored 60%, failed by 15, pass% = 65%: 65%T - 60%T = 15, 5%T=15, T=300.