prep 2 17

Kath1985

StoreSsoldatotalof90 copies ofa certian book during the seven days of last week, and it sold different numbers of copies on any two of the days. If for the seven days StoreSsold the greatest number of copies on Saturday and the second greatest number of copies on Friday, did StoreS sell than 11 copies on Friday?

(1) Last week StoreSsold 8 copies of the book on Thursday.
(2) Last week StoreSsold 38 copies of the book on Saturday.
是B
請問:
黃色部分是指任何兩天賣不同的數字 而後面又說這個任何兩天是指Sat.和Friday 反推回去不就是指 其他天都賣一樣的書嗎?
哪裡錯了?

oceantaferia

任意两天不卖相同的数字。如果七天当中卖最多的是星期六，卖第二多的是星期五，问星期五是否卖11本。