CA Foundation · Quantitative Aptitude · Ratio and Proportion, Indices and Logarithms
The duplicate ratio of 3 : 5 is:
The duplicate ratio of 3 : 5 is 9 : 25. A duplicate ratio is formed by squaring both terms of the given ratio. The triplicate ratio would cube them, and the sub-duplicate ratio would take square roots.
- A6 : 10
- B9 : 25Correct
- C27 : 125
- D√3 : √5
Explanation
The duplicate ratio of a : b is a² : b². So for 3 : 5 it is 9 : 25. Option 3 is the triplicate ratio and option 4 is the sub-duplicate ratio.
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