1．Four friends do yardwork for their neighbors over the weekend,earning 15，20，25，and40，respectively.They decide to split their earnings equally among themselves.In total how much will the friend who earned＄40 give to the others？（　　）
四位朋友在周末為鄰居做園藝工作，分別賺了15、20、25和40美元。他們決定平均分配他們的收入。那位賺了40美元的朋友將給其他人多少錢？（　　）

2．Four students take an exam.Three of their scores are 70，80，and 90.If the average of their four scores is 70，then what is the remaining score？（　?。?br />四名學(xué)生參加了一次考試。他們?nèi)说姆謹(jǐn)?shù)分別是70、80和90。如果他們四人的平均分是70，那么剩下的一位學(xué)生的分?jǐn)?shù)是多少？（　?。?/div>

3．Isabella had a week to read a book for a school assignment.She read an average of 36 pages per day for the first three days and an average of 44 pages per day for the next three days.She then finished the book by reading 10 pages on the last day.How many pages were in the book？（　　）
Isabella學(xué)校作業(yè)是一個(gè)星期讀完一本書(shū)。她在前三天平均每天讀了36頁(yè)，接下來(lái)的三天平均每天讀了44頁(yè)。然后，她在最后一天讀了10頁(yè)并讀完了這本書(shū)。這本書(shū)有多少頁(yè)？（　?。?/div>