wingonwong

take out 10 balls and 5 in each side
5 i6 ?0 K' g' f& _" iif both side balance mean the other 2 balls one of them must be the heavy one then just take them to weight will find out which one is heavier.5.39.217.77:8898. S" D+ L6 A& t/ Y3 z

4 p- S% h: `! p/ |if the heavy ball is inside the 10 balls, take out 4 balls from the heavier side which had 5 balls to weight 2 balls in each side.
  F9 B( r: _1 E  [if both side balance, which mean the one left is heavy one if not, just take the heavier side to weight will find out which one is the heaviest one.
( q! X' \, n, P, ~- P- h0 N5.39.217.77:88980 t2 t  r* ~5 n0 c6 a$ N+ c
used less then 1 min to find out the answer....