SOLUTION: How do you solve this? A total of 50 juniors and seniors were given a mathematics test. The 35 juniors attained an average score of 80 while the 15 seniors attained an average o

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Question 739800: How do you solve this?
A total of 50 juniors and seniors were given a mathematics test. The 35 juniors attained an average score of 80 while the 15 seniors attained an average of 70. What was the average score for all 50 students who took the test?
Answer by fcabanski(1391)   (Show Source): You can put this solution on YOUR website!
Average = (sum of the numbers)/(number of numbers)


For the juniors 80 = sum/35 so sum = 80*35 = 2800.


For the seniors 70 = sum/15 so sum = 70*15 = 1050.


The sum of the juniors scores and the seniors scores is the sum of all the scores. 2800+1050 = 3850.


Avg of all the students' scores is 3850/50 = 77

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