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Find number abc

If 6a787 - 1bc78 = 4880c find number abc. Multiple solutions may exist.

Correct answers: 46

The first user who solved this task is Eugenio G. F. de Kereki.

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Two women were sitting on the...

Two women were sitting on the front porch of the farm house when they saw a rooster chasing a hen. The hen ran straight into the road and was killed by a passing car.
One of the women sighed, "How beautiful. She'd rather die."

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Portland cement

In 1824, in Yorkshire, England, Joseph Aspdin, a stone mason, patented Portland cement, made by burning finely pulverized lime and clay at high temperatures in kilns (UK patent No. 5022). Thus Aspdin had made a manufactured counterpart to natural or Roman cement - a crude formulation of lime and volcanic ash used as early as 27 BC. Aspdin produced a hydraulic cement that would harden with the addition of water. He named his invention "Portland cement" not only to distinguish it from Roman cement, but also as a marketing tool: concrete made from his new cement resembled a highly prized building stone quarried on the Isle of Portland off the British coast. Like flour in a fruit cake, cement glues aggregate (sand or gravel) together to make a "rock" (concrete).

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