Q21. If a:b = 3:4, b:c = 5:4, and c:d = 7:8, find the ratio a:d.Mathematics — Ratio And Proportion — Question 21 of 75A. 100:128B. 105:128C. 105:112D. 120:128Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →