OBD-II Trouble Code: P0770
If you find your car have ‘Check Engine’ light on someday, you might be nervous. There are multiple reasons why the light went on. Continue reading “OBD-II Trouble Code: P0770”
Category: Curiosities & Conundrums
A cabinet of Mathematical Treasures.
舊作：【壬辰五月廿一日偶得】
壬辰五月廿一日偶得
吳經熊先生在【唐詩四季】裡曾提到他的一位朋友把【借問別來太瘦生，總為從前作詩苦】翻譯成“Gee! you are losing weight terribly/Maybe your poems have got all the weight you have lost!”。
風光滿眼無佳句，總失閒情最可知。
一站隔洋誰似我，惟增心重不增詩。
Winter is coming: How to Flush the Gas-based Water Heater
Depending on what the model you have, you may want to flush your Gas-based water heater every 1 to 3 years. At night before doing a flush, turn the Thermostat setting of the water heater from HOT to VAC (“Vacation”) so the water won’t be heated too much.
The steps to flush the water heater usually are: Continue reading “Winter is coming: How to Flush the Gas-based Water Heater”
《深夜過橋問題》
深夜過橋問題
這是一個典型的Bridge and Torch問題。說的是：
甲乙丙丁一行四人夜裡過一座一次只能走兩人的獨木橋，唯一的一隻手電筒需要每次過橋時照路用。四人的速度不同，但每次同行的兩人以速度慢的為準。其中甲單獨過橋速度是一分鐘，乙是二分鐘，丙是五分鐘，丁是十分鐘。問：這四人一共最少花多長時間會全部過去？
<1> 十八分鐘；<2> 十七分鐘； <3> 十九分鐘； <4> 十六分鐘。
《猜生日和猜牌》
猜生日和猜牌
幾年前，有一道猜生日的邏輯推理題（見「A Math Problem From Singapore Goes Viral: When Is Cheryl’s Birthday?」，Kenneth Chang April 14, 2015），筆者翻出來放在這裡讓感興趣的朋友再回顧一下。