self Maths Puzzle

There are 65cans of milk. Out of 65cans one can is poison. If a man drinks some milk from the poison to cans he will die in 14hours. So they are test with mice.. if mouse drinks some milk from poison can. it will die in 24 hours...what is a minimum number of mice require to find the poison can....

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self Other Question

Some students arranged picnic.The budget was Rs. 240.Because four students of the group failed to go,the cost to each student was increased by Rs.5. How many students went for the picnic? If a company invests Rs.2.5 lakhs for initial setup and its maintenance cost is Rs.60000 per year.After what duration the running cost of the plant will become Rs.20000 per month?