Question 1083620
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...average score of 90 on the first ten tests. 
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Amount of points earned,  {{{10*90}}}





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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((10*90+2t)/12=80)}}}----Solve for t to answer the question, "... average score of her last two...".