SOLUTION: Anna had an average score of 90 on the first ten tests. Her average after all twelve tests was eighty. What was her average score of her last two tests.

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Question 1083620: Anna had an average score of 90 on the first ten tests. Her average after all twelve tests was eighty. What was her average score of her last two tests.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
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...average score of 90 on the first ten tests.
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Amount of points earned, 10%2A90




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Her average after all twelve tests was eighty.
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Two added tests, total average now 80.
t, average for the last two tests:

highlight_green%28%2810%2A90%2B2t%29%2F12=80%29----Solve for t to answer the question, "... average score of her last two...".