divde the 12 balls into 3 sets of 4.
}; j& T6 I* `! e- Xweight any 2 sets.! D" Q) p/ f. p1 f% T& V
if the 2 sets are equal, then you know the heavy one is in the third( \8 m( O# F# ~: T1 G
if one of the 2 is heavier, then the heavy one is in that set公仔箱論壇( h" g: l+ i6 G# p! a2 P1 l1 m
then divide the 4 balls into 2.tvb now,tvbnow,bttvb" a3 T/ w: R+ `6 o0 B
weigh them
* t' }2 _! E3 A. ?( H( ktvb now,tvbnow,bttvband divide the heavier into 1tvboxnow.com, q0 `$ j3 {7 E+ u# h! }- D# v( \; @
and weight them.
5 w! @6 s- _+ M1 L& p* N3 x weighing and get the ans. , I, g+ d" \- d& C/ j
in less than 15 secs. |