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Two cool riddles: about 1)8 candies 2)3 bulbs!!!?
1)
Suppose, you have 8 candies; with exactly same shape, colour and size. But only one of them is slightly heavier than the other seven. You are given a beam balance. With only 2 (two) readings, how will you decide which of them weighs more?!
2)
Suppose you are standing on ground floor of a two-storey building. In front of you, there is an electric-switch board with three switches on it. On the second floor, three bulbs are present, which are connected to the switch board. The order between switches and bulbs is NOT one-to-one. By going up on the second floor only once (1 time), how will you decide, which switch is connected to which bulb?!
C'mon... they aren't the hardest ones!
Post here if you have more like these (with similar intellectual level required!).
Good luck!
1)You have to find out the specific one which weighs more, by weighing only two times!!!
3 Answers
- 1 decade agoFavorite Answer
AhA!!
I Solved the first item..
1. You will first weigh the 6 candies. 3 pieces on each beam.
Observe.
Choose which set is heavier.. because the hevier piece is there.
If the the two sets weigh the same. then.. the heavier piece is on the set which was not on the beam balance.
2. *you will next test(weigh) the set that has the heavier piece of candy. *
(If you have 3 pieces.)
weigh 2 pieces. one for each places on the beam balance.
Observe which of the two weighs more.
If they still weighs the same.. then.. the heavy candy is the one that is not on the beam balance..
:)
You will then know which one weighs heavier.
(If you have 2 pieces)
Just weigh them and find out which one is heavier
Sorry for my english. :P
I can't answer the 2nd item because someone already got it right..
- Anonymous1 decade ago
1) Divide them into 3 groups; 3, 3, and 2
Then weigh the groups of 3 against each other. Then, you can only have two results:
1. the two groups weigh exactly the same. then, the heavier one is in the last group and by weighing them against each other, you get the heavier one.
2. the heavier one is in one of the groups of three
then, take the heavier group and weigh any two from that group. if, they balance, then the one that was not weighed is the heavier one. if the weighing scale is unbalanced,then the heavier one will be quite obvious.
2) turn on the first switch, and let it remain that way for 10 min. then,switch it off and turn on the second switch. then,go to the second floor. if the bulb is lighted, then the bulb belongs to the second switch. if the bulb is not lighted, but is hot, then it belongs to the first switch.if the bulb is not lighted and not hot, then it belongs to the third switch.
Got the two riddles; will be looking out for more.
- 1 decade ago
Weigh them
You turn 2 switches "on" and leave 1 switch "off" and wait about a minute. Then enter the second floor, but just before you enter, turn one switch from "on" to "off". Once in the room, feel the lightbulb - if it is warm, but off, it has to be the last switch you turned off. If it is on, it has to be the switch left on. If it is cold and is off, it has to be the switch you left in the off position.
