Amath club took a math test. twelve of the members had an average score of 80. eighteen of the members had an average score of 86. what is was the class average

12 x 80 = 960
18 x 86 = 1548
960 + 1548 = 2508
12 + 18 = 30
2508/30 = 83.6

The class average is 83.6

Let’s add the percentages up.
There were twelve people who had an average of 80. With this, you just have to believe they all received an 80%. The same with the score of 86.
12•80=960
18•86=1,548
Now add them together.
960+1,548=2,508
Now add the total students.
12+18=30
2,508/30
83.6
The class average is 83.6%