Question

Review
Find the ratio compounded of the
duplicate ratio of 3:4, the
reciprocal ratio of 25:42 and the
sub triplicate ratio of 216:343.​

Answer 1

Duplicate ratio of 3 : 4 = 4 : 3

Reciprocal Ratio of 25 : 42 = 625 : 1764

Sub-duplicate ratio of 216 : 243 = 6 : 7

Compound ratio = $\bold{\frac{16\times 42 \times 6}{9\times 25\times 7}}$ = 4032/1575 ≈ 3 : 1