Answer : For this question to be solved you need to know the amount of sugar that is already present in the chocolate bar then we can do the further calculations.
Assuming that the sugar content is 10 % and when the size of the milk chocolate bar is reduced from 12.630 g to 5.0 g.
Then, it will be 10 /12.630 = 79.1 % was there,
And when reduced it was 79.1 % in 5 g will be = 3.95 g.
