In a certain examination, the average score of a student in three subjects is 85
Practice Questions
Q1
In a certain examination, the average score of a student in three subjects is 85. If the student scores 90 in the first subject and 80 in the second, what is the minimum score required in the third subject to maintain the average? (2023)
80
85
90
95
Questions & Step-by-Step Solutions
In a certain examination, the average score of a student in three subjects is 85. If the student scores 90 in the first subject and 80 in the second, what is the minimum score required in the third subject to maintain the average? (2023)
Step 1: Understand that the average score of three subjects is 85.
Step 2: Recall that the average is calculated by adding all the scores and dividing by the number of subjects.
Step 3: Let the score in the third subject be represented by 'x'.
Step 4: Write the equation for the average: (90 + 80 + x) / 3 = 85.
Step 5: Multiply both sides of the equation by 3 to eliminate the fraction: 90 + 80 + x = 255.
Step 6: Combine the known scores: 90 + 80 = 170, so the equation becomes 170 + x = 255.
Step 7: Subtract 170 from both sides to solve for x: x = 255 - 170.
