Question

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

A) 13/9 B) 23/11 C) 14/5 D) 21/9

Answer 1

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