英语智力测试!暑假作业里的~我会追加,谢谢各位了

英语智力测试!暑假作业里的~我会追加,谢谢各位了
1.There are sixty students in our class.Two-thirds of them are boys,and a quarter of them come to school by bike .Then how many boys in our class come to school by bike?
A.10 B.20 C.30 D.40
2.If▲+□=10 ▲-□=4,what is ▲X□?
A.6 B.14 C.20 D.21
3.A cow walks towards the west,and then it turns to the north at 90 degress.Do you know in which direction the cow's tail is now?
A.west B.south C.east D.down
4.There are 49 birds and hares.A bird was two legs and a hare has four.There are 100 legs in all.So there are( )bieds and ( )hare(s).
A.45,4 B.48,1 C.42,7 D.23,26
5.An old woman took some chickens to the market.By rule,she had to give half of her chickens to the checkpoint, and they gave one of them back ti her.When she lelf the fifith checkpoint,she had only two chickens left.How many chickens did she have when she started?
A.2 chickens B.4 chickens C.16 chickens D.32 chickens
还有一题：
1.（1）Grandpa:You give me three bottles,and I give you a bottle of juice.All right?
Tom:All right.
(2)Dad: Here are 21 bottles of orange juice.Tom.
Tom:Thank you, dad.
(3)Tom:I will drink up all thess bottles of orange juice,and will give the bottles to Grandpa.Then he will give me some bottles of orange juice.
Dad:You are clever.
Tom:How many bottles of orange juice will I drink in all?_____
2.Dr Watson had planted a rather strange-looking plant in the center of the garden at 211 Baker Street.The plant grew rapidly,doubling in size every day.If it took the plant 50 days to cover the whole garden,how long would it take to cover half the garden?________
3.Here are seventeen apples and three boys-Lin Tao,Dave and Tom.Now Lin Tao wants one half;Dave wants one third and Tom wants one ninth.How to divide the apples among them?Please think carefully and help them out,will you?_____
回答带翻译.谢谢!

1.A（在我们班里有60个学生,他们当中有2/3是男生,并且男生中有1/4骑自行车来学校,在我们班里有几个男生骑自行车来学校?
2.D（设▲为X,□为Y,则X+Y=10,X-Y=4,很容易算出X=7,Y=3,所以为21
3.D(一个牛向着西走,然后它转了90°朝向北,你知道它现在尾巴朝向哪个方向吗?)无论牛怎么走,尾巴总朝下,
4.B(有49个鸟和野兔,一只鸟有两条腿,一只野兔有四条腿,总共有一百条腿,所以有几只鸟和几只野兔?)
5.D一个老妇人带着一些鸡腿到集市,按规则,她必须把她鸡腿的一半给检查站,然后它们在还给老妇人它们所得的一半,当她离开第十五个检查站,她只剩下两个鸡腿,问她一开始有几个鸡腿?