Balance Beam Scale Riddle 7 Marbles

A balance puzzle or weighing puzzle is a logic puzzle about balancing items often coins to determine which holds a different value by using balance scales a limited number of times.

Balance beam scale riddle 7 marbles.

If it s not completely clear how we can make the assumption that the bad coins is in group 7 8 9 when the scales balance remember we know there is a bad coin there has to be we have eliminated the other two. Weigh 7 vs 8 if they balance then 4 is the odd light ball or the heaviest of 7 vs 8 is the odd heavy ball. Split the marbles into 3 groups with 4 marbles each. Yeah i probably shouldn t have even bothered with the picture.

If the 2 groups weigh the same the heavier marble is in the 3rd group. 1 you have 9 marbles as seen. If 1 2 5 vs 3 6 12 balances then either 4 is the odd light ball or 7 or 8 is the odd heavy ball. You are given a set of scales and 12 marbles.

That is a small dish hangs from each end of a rod that is balanced in the middle. Pick 2 groups and use the scale to determine which group contains the heavier marble. Scale balances means the heavy coin is in group 7 8 9 using one weighing we have successfully narrowed three groups down to one. 2 8 of them are exactly the same weight.

The scales are of the old balance variety. In any case on to the riddle. A real weight balance or scale looks slightly like the apparatus i drew above.