The titles of adeles four studio albums add up to what

Less than 100

Explanation:

Over the past decade, Adele has become one of music’s biggest stars, selling more than 100 million records worldwide. Her album titles each represent her age, so each project is meant to act as a snapshot of her life at that particular age. Adele released the albums "19" in 2008, "21" in 2011, "25" in 2015, and "30" just last week (which adds up to 95). Adele’s album names reflect the age she was when she wrote them rather than the age she was when they were released. Adele explained that the album ages and her names never quite coincided, saying, "I was 20 when 19 came out, and I was 23 when 21 came out."