Question

The compound ratio of 9:5 and a:100 is ________

• A. 9a:500
• B. 45:100a
• C. 81:100a
• D. 100a:45

Answer 1

The correct option is A

9a:500

For two or more ratios, if we take antecedent as product of antecedents of the ratios and consequent as product of consequents of the ratios, then the ratio thus formed is called compound ratio.

Thus, the compound ratio of 9:5 and a:100 is (9 $\times$ a) : (5 $\times$ 100) = 9a : 500