1) One hundred doors are numbered 1 through 100.
They are all closed to start with. Now someone start to call out number: 1. All doors numbered multiples of 1 will switch state, (in this case, all doors will open). Then he calls out 2, all doors numbered multiples of 2 will switch state, (all even doors will close). Then he calls out 3, 4, 5 and so on, till 100.
When he calls a number, the doors numbered multiple of that number will switch state.
Question : At the end, how many doors are open and how many doors are closed?
2) Rohan is very fond of water-melon ...He is carrying a water-melon along side in the journey ..but if he carried weight more than 5 kgs ...he feels uneasy .water-melon is 99% of weight by water and its current weight is 5 kg..now he thinks of some trick ..he leaves it in sunshine fr some time ..now the water melon is 97 % of water by weight ..and nw he can carry the melon quite easily ..can u tell me whts d new weight of water melon now ??
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2 comments:
10 and 90
5/3 kg
Ans for second puzzle is 4.85 Kg. Is that correct?
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