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**t.d.** I have to take a placement test for math for school. The problem is that I haven't done any math in 2 years so my mind is a little rusty. These simple questions are stumping me.

How do you solve a problem that asks you:

1) what value of x solves the following proportion?

9/6=x/8

I thought the answer would be 11, but it apparently is 12. How do you go about getting the proper answer?

And also,

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?

I am so lost at how to figure this out.

any help will be greatly appreciated!