Latest self Aptitude Question SOLUTION: There are 12 coins. One of them is false; it weights differently. It is not known, if the false coin is heavier or lighter than the right coins. How to find the false coin by three

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(#M40010131) SELF question Keep an EYE

There are 12 coins. One of them is false; it weights differently. It is not known, if the false coin is heavier or lighter than the right coins. How to find the false coin by three weighs on a simple scale?

Anand (11 years ago)

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Garima  (11 years ago)

Mark coins ABCDEFGHIJKL
First weighing:-

put ABCD on one side and EFGH on other side of balance.

If equal, then 3rd group, IJKL has the odd coin which can be easily found in next 2 weighings.

If ABCD > EFGH,

it means either one of ABCD is heavier or one of EFGH is lighter.

2nd weighing:-
Put ABE in one Pan and CDF in other pan.

If equal, one of GH is lighter which can be found in 3rd weighing.
If ABE>CDF, then either one of AB is heavier or F is lighter which can be found in 3rd weighing by placing A on one side and B on other side.

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