Question

Ten students take a test. Five students get a 50. Four students get a 70. If the average score is 55, what was the last student’s score?

Answer 1

20%

Explanation:

50x5 + 70x4 = 530. 530 divided by 9 equals 58.89. When you add 20 to 530 you get 550. 550 divided by 10 equals 55. The student got a 20%.

Answer 2

Answer:20

Explanation:

average= total/number of items/students/whatever you take. So, here its ((5x50)+(4x70)+m)/10=55 and if you solve m you get 20 as the answer!