CA Foundation · Quantitative Aptitude · Ratio and Proportion, Indices and Logarithms
The ratio compounded of 2:3, 9:4 and 5:6 is:
Compounded ratio is found by multiplying the antecedents together and the consequents together. Here 2×9×5 gives 90 and 3×4×6 gives 72. The ratio 90:72 reduces by 18 to 5:4, so the compounded ratio is 5:4.
- A4:5
- B3:2
- C5:4Correct
- D5:6
Explanation
Multiply all antecedents: 2 × 9 × 5 = 90. Multiply all consequents: 3 × 4 × 6 = 72. The ratio 90:72 reduces by dividing both by 18 to 5:4. The option 4:5 is the inverse, which results from reversing the order of the terms.
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