What is three quarters plus two fifths?

To add three quarters (3/4) and two fifths (2/5), you first need to find a common denominator. The least common denominator of 4 and 5 is 20. Converting both fractions gives you 15/20 (for 3/4) and 8/20 (for 2/5). Adding them together results in 23/20, which can also be expressed as 1 3/20.