Math Is Fun Forum

First off thank you all in advance! So glad I found this place.

Also please do NOT tell me the answer, I don't want the answers I just want to know HOW to go about solving them for myself. I know that with averages you typically add all the numbers together then divide by the numbers you added. But these have me stumped.

At a certain high school, the respective weights for the following subjects are: Mathematics 3, English 3, History 2, Science 2 and Art 1.
What is a student's average whose marks were the following: Geometry 89, American Literature 92, American History 94, Biology 81, and Sculpture 85?

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In a college, some courses contribute more towards an overall GPA than other courses. For example, a science class is worth 4 points; mathematics is worth 3 points; history is worth 2 points; and English is worth 3 points. the values of the grade letters are as follows, A=4, B=3, C=2, D=1, F=0. What is the GPA of a student who made a "C" in Trigonometry, a "B" in American History, an "A" in Botany, and a "B" in Microbiology?

I understand the concept of adding the numbers together and then dividing but do I add the weights in the first section into the averages and then divide by 5 or what? Do I ignore the GPA points for the classes or add them in and then do I divide by 4 or 8 on the second one?  Please like I said please just explain HOW to solve this, not the answer. Thank you very much!