Question #N681
A group of 20 students took a test. The average score on the test was 75. If 10 students scored an average of 80 on the test, what was the average score of the other 10 students?
A. 65
B. 70
C. 75
D. 80
Correct Answer is: B
The total score for all 20 students is 20 * 75 = 1500. The total score for the 10 students who scored an average of 80 is 10 * 80 = 800. The total score for the other 10 students is 1500 – 800 = 700. Therefore, the average score for the other 10 students is 700/10 = 70.