15.75
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15. ten in one, half that in a half.
5
They are the values of the different columns in the place value system we use. Each column is ten times bigger than the column to its right and ten times smaller than the column to its left. The whole (or units or ones) is ten times bigger than one tenth; The hundred is one hundred (or ten times ten) times bigger than one whole, making it one thousand (ten times ten times ten) bigger than one tenth.
The answer is 2.5.
one trillion ten