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Find number abc

If 6cba7 - a8779 = bb6c8 find number abc. Multiple solutions may exist.

Correct answers: 1

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Running out of money

The only exercise i've done this month is running out of money.

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Aluminium process patent

In 1889, Charles M. Hall patented an inexpensive electrolytic process to extract aluminium from its ore (No. 400,655) which he had invented on 23 Feb 1886. Although aluminum is the most abundant metal in the earth's crust, it is not found naturally in pure form, and thus it must be separated from its surrounding ore.

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