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For The Mathematically Inclined

Anil Saigal

2 men and 2 boys need to cross a river in a boat big enough for 1 man or 2 boys. How do they do it?


This subtraction sum uses all the digits from 1 to 9.

  9 * *  - * 4 *    -----    * * 1  

Please send your solutions to mr.asaigal@gmail.com.

Use Problem Solutions M-091511 as the subject line. Please include your full name in the text of the main message. Everyone with the right answer will be acknowledged in the next issue of Lokvani.

Please do not post your solution in Post Comments. No credit will be given for solutions not sent to anil@lokvani.com.

If you need clarification on any problem, please contact anil@lokvani.com.


Problems from 09/01/11

How many liters of pure water should be evaporated (removed) from 160 liters of 12% saline (salt) solution so that the solution that remains is a 20% solution?

60 liters.

Two trains, one 500 meters long and the other 1000 meters long, are traveling in opposite directions on parallel tracks. The first train is traveling at 100km/h and the other at 80km/h. How long will it take for the trains to pass each other from the moment the locomotives are at the same point?

30 s. 

Congratulations to N. Alamelu, Praful Thakkar, Smit Kadakia, Stephen Snider and Suhas Joglekar, who were the winners of the last set of puzzles.

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