How many bowling balls are i...
How many bowling balls are in that picture?Correct answers: 88
The first user who solved this task is Jasmina Atarac.
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Street cleaning machineIn 1854, Philadelphia residents were amazed as the first practical street cleaning machine was put into operation this day. A series of brooms attached to a cylinder mounted on a cart was turned by a chain driven by the turning of the cart's wheels. |