| by Serhiy Grabarchuk, Jr. |
|
|
 |
|
|
Suppose you have special electronic
scales as shown in the topmost diagram. Everything put on them to
the right of the central black line is measured on the right scale and the
precise weight is shown on the right display. Everything put to the
left of the line is measured on the left scale and the weight is
indicated on the left display.
Three pieces shown in the bottom row are made of several identically-looking
cubes – three, four, and five respectively. All the cubes except one
weigh 2 kg each. That one weighs 1 kg only. The mass of each cube is
distributed evenly in it.
Can you identify the lighter cube in just two weighings on the
scales?
|
|
|
|
|
