Find a 10-digit number, where the first figure defines the count of zeros in this number, the second figure the count of numeral 1 in this number etc. At the end the tenth numeral character expresses the count of the numeral 9 in this number.
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There are two bottles of 10 liter; each completely filled with water. Now 2 persons having empty bottles of 4 liter and 5 liter want to take 2-2 liters of water. You can use only these 4 bottles (10 liter-full, 10 liter-full, 5 liter-empty, 4 liter-empty) to transfer the water. Wasting or throwing of water is not permitted. How can this be done?
Note: It is assumed that you can not measure water level by comparing water level, or by judging, it should be exact 2 liters of water finally in each 4 and 5 liter water bottle.
We have 25 horse from which we want to find the fastest three. Every match we can only have 5 horse. What is the minimum number of matches we must have?
There are 8 idential containers filled with same material from which one has some poison added to it. Scientists can run find out it a container is poisonous by giving some of the liquid to a laboratory rat. The result would be revealed after a week. They only have one week to find which one is poisonous. The question is what’s the minimum number of laboratory rats they can use to find the poisonous container?
We have three ropes of the same length and all burn in 1 hour if inflamed from one side. The have oil at random parts. This means they don’t have consistent rate of burning throughout the length.
Rule: you can only burn from the sides of the rope and not anywhere alongside the length.
How can we get 1 hour and 15 min from burning the ropes?