By what number should 7 by 15 be divided to obtain 2 by 9. Share with your friends Share 0 Sanjari Kalantri answered this Dear Student, Let the number be x.Then, 715 ÷ x = 29⇒ 715 × 1x = 29⇒ x = 715 × 92 = 6330 = 2110 0 View Full Answer Aman Sharma answered this 3.5 0