GMAT Test Prep: DS-65683857 GMAT Data Sufficiency

A certain one-day seminar consisted of a morning session and an afternoon session.;;If each of the 128 people attending the seminar attended at least one of the two sessions, how many of the people attended the morning session only?

(1) 3/4 of the people attended both sessions.

(2) 7/8 of the people attended the afternoon session.