新加坡小学数学题如此之难，难怪现在小学生象棋砍我很轻松，中学生可以砍甲级。
政府从小就培养了小学生超凡的数理逻辑能力，使得他们能在复杂的局面下看的一清二楚。

我在网上找了一下今年小学毕业考试PSLE数学的题目，大家有兴趣的话看看吧。
小学应该是不可以设X的。

这个是著名的被头条登出的Jim和Ken的问题。
Jim bought some chocolates and gave half of it to Ken. Ken bought some sweets and gave half of it to Jim. Jim ate 12 sweets and Ken ate 18 chocolates. The ratio of Jim's sweets to chocolates became 1:7 and the ratio of Ken's sweets to chocolates became 1:4. How many sweets did Ken buy?. Ans:

下面这个自行车的问题也难，
Mei and Lin were in a bicycle race. Mei was travelling at a constant speed of 20km/hr and they both did not change their speed. When Lin completed half the race, Mei was 3.5km ahead. Mei completed the race at 10.45am. What time did Lin complete the race? Ans:

下面几道题还算可以，但整个paper整体难度的确很高。
Sally baked some cookies to sell. 3/4 of them were chocolate cookies and the remaining were almond cookies. After she sold 5/6 of chocolate cookies and 210 almond cookies, she had 1/5 of the cookies left. How many cookies did she sell?
Ans:

Curry puff shop sells puffs at $0.80 each. Offer:Buy 3 get 4th half price. If customer has $50, how many puffs can he buy if he buys as many as he can.
Ans:

String of 2 big balloons is 90cm
String of 5 small balloons is is 1.2m
If both strings are of the same length, there would be 105 more small balloons than the big balloons. How many balloons are there altogether?
Ans:

6 friends decided to rent computers from 2pm to 4.30pm. While 4 of them were playing, the other two would watch. If the cycle continues, and each of them played for equal number of minutes, how many minutes will each person get to play?
Ans:

如图：ABCD是正方形，GH平行于AD，EF垂直于GH。现在知道FG=FE=FH。求角GEH的大小

专业人士。

著名的Jim和Ken的问题：
Jim用自己的钱换了一堆红筹码，Ken换了一堆蓝筹码。他们互相分了一般给对方。
Jim去玩骰子输了12个蓝筹码，Ken去玩21点输了18个红筹码。现在Jim的红蓝筹码比例为1：7，Ken为1:4
问：Ken买了多少个蓝筹码？


下面这个自行车的问题变成：
Mei和Lin问大耳隆借钱去赌场赌输了后遭到大耳隆讨债，Mei和Lin看到大耳隆来追他们时准备逃跑，要逃到最近的警察局。Mei以每小时20公里的速度逃跑，当Lin跑到一半时，Mei在她前面3.5公里。Mei在10：45分跑到了警察局，问Lin几点时跑到警察局？


Curry puff shop sells puffs at $0.80 each. Offer:Buy 3 get 4th half price. If customer has $50, how many puffs can he buy if he buys as many as he can.
Ans:
咖喱包题可以这样出：
赌场开张迎宾大减价，1个筹码买8毛，每买3个能半价买第4个。一个顾客有50块钱，问他买了几个筹码？


6 friends decided to rent computers from 2pm to 4.30pm. While 4 of them were playing, the other two would watch. If the cycle continues, and each of them played for equal number of minutes, how many minutes will each person get to play?
Ans:

玩电脑可以这样出：
6个小学生去赌场玩老虎机，由于人太多，他们只找到4台没人玩的机器，这样他们就轮流玩，4个人玩，2个人看，然后轮流换位。请问从下午2点到4点半，他们每人玩了几分钟？

解法一：
如图：ABCD是正方形，GH平行于AD，EF垂直于GH。现在知道FG=FE=FH。求角GEH的大小

从ABCD是正方形，GH平行于AD 可知 EF 垂直于AD和BC 而且 EF= AB=DC=AD=BC=边长=GH
可以得出三角形GFH为等边三角形 GFH=60deg EF垂直于GH 必然平分GH
交点为K GFK 全等于HFK 所以GFE=HFE=顶角的一半60/2=30deg
GFE and HFE 为等腰三角形（由于FG=FE=FH） GEF=(180-30)/2=75deg
同理HEF=75deg
所以 角GEH=75+75=150deg


解法二：
找一量角器 如果图画的足够标准 直接测量得出=150度 哈哈

应该有个规的。应该画个圆圈吧。

画圆圈真是绕远路，哈哈。