8 is related to 28,in the same way as 7 is related to-
Dear Student,
If 8 is related to 28, then
27 is the answer. Simple.
That means 7 is related to 27 which is the required solution to your query. You can solve such questions or numericals through UPSC books available online and in offline book stores with answer key available with them.
Hope this resolved your query. Feel free to drop such queries related to this or else. We are always ready to help you.
All the Best!!