Set Problems (Part 2)

There are 30 students in a class. Among them, 8 students are learning both English and Math. A total of 18 students are learning English. If every student is learning at least one language, how many students are learning Math in total?

There are 30 students in a class. Among them, 8 students are learning both English and Math. A total of 18 students are learning English. If every student is learning at least one language, how many students are learning English only?

In a group, there were 115 people whose proofs of identity were being verified. Some had passport, some had voter id and some had both. If 65 had passport and 30 had both, how many had voter id only and not passport?

In a group, there were 115 people whose proofs of identity were being verified. Some had passport, some had voter id and some had both. If 65 had passport and 30 had both, how many had voter id?

25 high school students who were asked whether they use either Facebook or Twitter or both

15 students who used Facebook

12 students who used Twitter.

How many used Facebook only?