Answer:
The hospital gets
of medicines from these three companies.
Step-by-step explanation:
Company A has
milligrams, which is
milligram more than Company C's.
If
, are the medicines produced by Companies A,B,C, respectively,
then,
, and its expression is given as,

Company A has
milligrams, which is twice the difference between the weight of Company B's supply and Company C's.
So, its expression is given as,

Substituting values of
, the expression becomes,

So, the hospital gets,

of medicines.