HR Interview Interview Logical Reasoning General Mental Ability

There is a 40 kg stone that broke into 4 pieces such that you can measure any weight between 1kg to 40 kg using a balance. What are the weights of the broken pieces?

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1, 3, 9, 27 kg.

By using these weights any weight between 1 kg to 40 kg can be measured, like 1, (3-1), 3, (3+1), (9-1-3), ...
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HR Interview Other Question

There are two gates, one to hell and the other to heaven. Two gatekeepers, one for each gate. One of them always speaks the truth and the other always lies but you don’t know which one guards which gate. You are allowed only one question and you need to find out the gate to heaven. Assume that 1 rupee = 20 sparrows = 1 crow & 5 rupees = 1 parrot. You have 100rs and have to spend your whole money in such a way that you buy 100 birds in total. (Condition: you have to buy all three birds.). What will you do?