Each can of green beans costs ($3.00/5) = 60¢ at the village market, and ($6.10/10) = 61¢ at Sam's Club.
If you're watching every penny, then that MIGHT be enough of a difference to make you decide to buy your beans at the village market, but not necessarily.
If, say, the village market is farther away from you, or if there are other things you're going to get from Sam's anyway, then you should buy your beans there too.
The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. One plate holds an object of unknown mass (or weight), while known masses are added to the other plate until static equilibrium is achieved and the plates level off, which happens when the masses on the two plates are equal. The perfect scale rests at neutral. A
