纽约时报上转载的新加坡的数学题: Albert and Bernard just met Cheryl. “When’s your birthday?” Albert asked Cheryl. Cheryl thought a second and said, “I’m not going to tell you, but I’ll give you some clues.” She wrote down a list of 10 dates: May 15 — May 16 — May 19 ...
1. Onebrickisonekilogramandhalfabrickheavy. Whatistheweightofonebrick? 2. A passenger train leaves New York for Boston traveling at the speed of 80 km/hr. In half an hour a freight train ...