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Answer : 4 36 years Explanation : Answer: D) 36 years Explanation: Let present ages of Sushanth = w, Krish = x, Rishi = y and Rohit = z , thenw x y = 43 x 3 = 129 ---(i) andw y z = 49 x 3 = 147 ---(ii)Subtracting (i) from (ii), (w y z) - (w x y) = 147 - 129 , z - x = 18 ---(iii)Given Rohit