Typing trouble?

Algebra Level 2

A mother asked her daughter to type a manuscript. The daughter claimed: " 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", the daughter concluded.

"No, you didn't," her mother said.

Who was right?


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