A student obtains 75%, 80%, and 85% in three subjects. If the marks of a fourth subject are added, their average score cannot be less than 80%. What is the minimum percentage required in the fourth subject?
Q1. A student obtains 75%, 80%, and 85% in three subjects. If the marks of a fourth subject are added, their average score cannot be less than 80%. What is the minimum percentage required in the fourth subject?
Answer: 80%
Explanation: The correct value is 80%. Apply the formula or arithmetic step shown in the question and