Sorry for the long absense. I have been busy at home and will be flying back to the US in less than a week.
I think not more one minute will be given to answer most of the questions. However, we do not need to answer the questions at once, but do it step by step by reasoning. Explanation and reasoning are more important although a correct final answer will be impressive.
Bear in mind that this is only one small session of the interviews. I am very glad that there are many ReCom members here who can answer the puzzles here accurately and are potential employees of top companies.
Actually, my main reason for creating this thread is not only to create awareness of such a test in job interviews, but also to encourage and cultivate logic and creative thinking in everyone. I feel fortunate to be given the chance to learn these puzzles and hope that others who have been reading this thread will contribute by sharing interview questions/ puzzles that they have encountered in interviews.
Thanks, luke for modifying the question, making it more challenging. I hope others can do the same by posting edited questions that have been asked.
Please feel free to email new questions to
so that we can organize this forum thread better.
Big applause again to luke and silverblue for correctly answering the Question 5.
Answer for Question 5 quoted from luke:
just get one pill from jar 1, 2 pills from jar 2, 3 pills from jar 3 .. continue for jar 4 and jar 5 .. then put all those pills on the scale and get the reading .. the jar with contaminated pill is (150-reading) .. so if the reading is 148 then the contaminated jar is jar 2 ... if it's 149 then it's jar 1 ... if it's 150 then the scale is broken and should be replaced, or all the pills are safe and you are overcautious
Thanks for trying!
-Hui Lin ^_^