Multiple choice

In a science competition having three different rounds, a student scored 80 points in the first round and 65 points in the second round. To maintain an overall average of at least 75 points, what is the minimum score the student must achieve in the third round?

  1. 76

  2. 78

  3. 80

  4. 84

  5. 87
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C Correct answer
Explanation

Average of 3 rounds >= 75 means total points >= 225. Current points = 80 + 65 = 145. Required points = 225 - 145 = 80.

AI explanation

To maintain an overall average of 75 across three rounds, the required total score is 3 multiplied by 75, which equals 225 points. The student has already scored 80 in the first round and 65 in the second round, giving a current total of 145 points. Subtract this current total from the required total to find the third round score: 225 minus 145 equals 80. The student must achieve a minimum score of 80 in the third round.

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