Mother asked Vera to type a manuscript. Vera decided: "I will type an average of 20 pages a day."
She typed the first half of the manuscript rather lazily, at 10 pages a day. To make up for it, she typed the second half at 30 pages a day.
"See, I did average 20 pages a day," Vera concluded. "Half of 10 + 30 is 20."
"No, you didn't," her mother said.
Who was right?
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