The prefix "deci-" means tenth, so a deciliter is one tenth of a liter. Thus, there are 10 deciliters in a liter.
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There are 100 decilitres in one litre. Therefore, 2.5 decilitres is equal to 2.5/100 = 0.025 litres.
So you have 3.05x10, which is 30.5 decilitres. This is 3050 millilitre. Therefore, this is 3,050,000,000nanolitres.
A half (1/2)
It could refer to density, where the mass is measured in milligrams and the volume in decilitres. Or It could refer to concentration in a fluid where the mass of the "active" substance is measured in milligrams and the volume of the solution (possibly solute) is measured in decilitres.
100ml is one tenth (1/10) of a litre