"Nothing of the sort."
Fifi coughed. "I don't see why, exactly."
"When the text says 'six days longer,' it means longer than what?"
"Why—longer than ever."
"Doubtless. But you must state it in terms of the problem."
"In terms of the problem," murmured Fifi, her red-brown head bowed over the bewildering book—"in terms of the problem."
"Of course," said her teacher, "there is but one thing which longer can mean; that is longer than the original rate of progress. Yet you add the six to the time required under the new rate of progress."
"I—I'm really afraid I don't quite see. I'm dreadfully stupid, I know—"
"Take it this way then. You have set down here two facts. One fact is the number of days necessary under the old rate of progress; the other is the number of days necessary under the new rate. Now what is the difference between them?"
"Why—isn't that just what I don't know?"