what will be the amount of sugar in milligram if the size of the milk chocolate bar is reduce from 14.630g to 5.000g

Solution:

That is depend on the amount of sugar in the original (14.630) bar.

For example, if the 14.630g bar contains 1.234g of sugar (=1234mg),

Then by proportion the 5.000g bar contains:

1234 x (5.000/14.630) = 341.76 mg sugar.