How many students are there in all in the institute of Arts, Commerce and Science? I. 20% of the students study Science. II. The numbers of students studying Arts and Commerce are in the ratio of 3 : 5. III. The number of students studying Commerce is more than that studying Science by 375.

As per given above statements , we can see that
I. % of the students study Science = 20%
II. The ratio of numbers of students studying Arts and Commerce = 3 : 5.
III. The number of students studying Commerce is more than that studying Science by 375.
From above it is clear that Statements I and II give the percentage number I of students studying in different disciplines. Combining this with (iii), the total number of students can be determined.