The Group of 20 is an organization consisting of Finance Ministers and Central Bank Governors (G-20, G20, Group of Twenty) from 20 economies: 19 countries plus the European Union, which is represented by the President of the European Union and by the European.
en.wikipedia.org/wiki/Group_of_20
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iodine and Astatine
Since there are five numbers in that group, the mean (average) of the group is 1/5 of their sum.
A score is a 'group of 20' in numbers. So, that would be 20 years. Lincoln's 'four score and seven' was to indicate 87 years.
Score is an old English term meaning a group of twenty, so 2 score and 6 means 46 (20+20+6)