τὸ ὅλον τόδε ποσαπλάσιον τοῦδε γίγνεται → how many times greater is this whole sum than that one
quindĕcĭes: (-dĕcĭens), adv. quindecim,I fifteen times: quindeciens sestertium (neutr. sing.), fifteen hundred thousand sesterces, Cic. Verr. 2, 2. 25, § 61; Mart. 7, 10, 15.
quīndĕcĭēs (cĭēns), quinze fois : Cic. Verr. 2, 2, 61.