John assumes that the number is known. It is implied in the twelve baskets of fragments. As in so many other instances in this Gospel, facts of the synoptic narrative are taken for granted as familiar.
Will ye also go away? (μὴ καὶ ὑμεῖς θεÌλετε ὑπαÌγειν)
The interrogative particle μὴ shows that a negative answer is expected. Surely ye will not. Will ye go is not the future tense of the verb to go, but is expressed by two words, do ye will (θεÌλετε), to go away (ὑπαÌγειν). Rev., would ye. On the verb to go away, see on they went (Joh 6:21).