The following question has three statements. Study the question and the statements and decide which of the statement(s) is necessary to answer the question. Find the compound ratio of a ∶ b and c ∶ d. I) The value of ratio a ∶ b is 11 ∶ 15. II) The value of ratio c ∶ d is 5 ∶ 3. III) The compound ratio of ratios a ∶d and c ∶ b is 11 ∶ 9.
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