What is 30/40 simplified

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)