A student obtain 75%, 80% and 85% in three subjects, if the marks of another subject are added then the number can’t be less than

🧠 Explanation:

A student with 75%, 80%, and 85% in three subjects cannot have an overall average below 60% when a fourth subject’s marks are added. Since the minimum possible mark in the fourth subject is 0%, the average of 75, 80, 85, and 0 is (75 + 80 + 85 + 0)/4 = 60%. Any positive mark raises the average above 60%. This problem illustrates averaging in academics, ensuring fair grading systems, relevant in educational assessments and statistical analysis.