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Answer : 4 36 yrs Explanation : Answer: D) 36 yrs Explanation: Let present ages of Sumit=w, Krishna=x, Rishabh=y and Rohit=z , thenw x y = 43x3 = 129 ---(i) andw y z = 49x3 = 147 ---(ii)Subtracting (i) from (ii), (w y z) - (w x y)=147 -129 , z- x =18 ---(iii)Given Rohit