Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. Two puzzles are presented each week: the Riddler Express for those of you who want something bite-size and the Riddler Classic for those of you in the slow-puzzle movement. Submit a correct answer for either,1 and you may get a shoutout in next week’s column. If you need a hint or have a favorite puzzle collecting dust in your attic, find me on Twitter.

Passenger travel would likely fall 45% on-year during the 40-day travel season that ends Feb. 18, Liu Xiaoming, a vice minister at the transport ministry, said at a briefing in Beijing Saturday. Between Jan 25. and Feb. 14, airlines carried an average of 470,000 people a day, only a quarter of last year’s volume. Passenger numbers from Feb. 15-23 are estimated to be one 10th of the peak period, said Li Jian, deputy head of the Civil Aviation Administration of China.

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