exam Maths Puzzle Numerical Ability

the total of 50 juniors and seniors were given a math test. the 35 juniors averaged a score of 80, while the 15 seniors averaged a score of 70. What was the average score for all 50 students?

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exam Other Question
7x + 3 = 2x - 12 Hello,
I tried to work out this problem: 2x^4+10x+8=0 and i got that x=+ or - i and x=+ or - 2i.
Would you mind looking over those answers and telling me if they are correct?
Thank you so much!
Kendall