Tom is making a necklace,he starts with 2 red beads,3 white

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Tom is making a necklace,he starts with 2 red beads,3 white beads,and 4 blue beads,in that order,and repeats the pattern until there is no more room on the necklace.if the last bead is white,which of the following could be the total number of beads on the necklace?
A.72
B.76
请问为什么啊.
还有这一道题目我根本就没有看懂.
of the 240 students at a camp,5/6 could swim,if 1/3 of the students took climbing lessons,what was the least possible number of students taking climbing lessons who could swim?
A.20
B.40
C.80
为什么啊.
可是第二题问的是least possible。为什么又是选最多的呢？

汤姆做一条项链,他开始以2个红色小珠,3个白色小珠和4个蓝色小珠,依此顺序,并且重覆样式,如果最后小珠是白色的,以下项链哪个可能是小珠的总数?
答案：2+3+4=9个小珠是一个顺序轮回第3、4、5个小珠是白的,所以小珠的总数除以9余数是3、4、5的即是76除9余4
240名学生在夏令营,其中5/6会游泳,如果所有学生的1/3选择攀岩课,最少的参加攀岩课又会游泳的学生数量是多少?
答案：根据题,200人会游泳,共80人选攀岩课,应该是让最多40个不会游泳的报名攀岩课,剩下的40个名额由会游泳的同学参加,那么这道题应该选B 40才对,如果这题目是外国人出的,出错就合理了,因为外国人在数学方面就很弱的,请这位同学想想吧.

英语翻译Mum, tom is making a mess. tom, you shouidn't play with He is washing his white shirt.同义句He is making his ( )white s 翻译If a friend is to be made with ,he or she is worth making Tom is ___?A:making tea B:making some tea C:making the tea D Mr.Black is a very yellow one.He is very red with anger when He is making a cake,英译汉. Is he brother making a kite?改错 He is making a plan________the summer holidays. She is dressed _____ a white skirt _____ red flowers. 同义句转换 He is a boy named Tom.He is a boy with—— ——Tom . she is making tom a new coat 改为被动语态 tom is making a plan for his acation、、甚意思