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If a/(a+b) = 15/21, what is (a+b)/(a-b) is equal to?

Correct Answer: 21/9

Explanation:

a/(a + b) = 15/21 → a = 15, a + b = 21


→ b = 21– 15 = 6
⇒ a – b =15 – 6 = 9
⇒ (a + b)/(a – b) = 21/9


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