Mathematics, 11.09.2021 05:30 myiacoykendall

Peter and Diane have the same average in mathematics. On the next test, Diane scored 97%, and her average improved to 90%, but peter scored 73%, and his average decreased to 87%. How many tests had preceded this last test?

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Peter and Diane have the same average in mathematics. On the next test, Diane scored 97%, and her av...

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