Sindhu is 40 years old and Smita is 20 years old. How many years ago was Sindhu three times as old as Smita?

Let she was 3times before x years, So, 40 – x = 3(20 – x) 40 – x = 60 – 3x 3x – x = 60 – 40 2x = 20 x = 20/2 x = 10 It means that she was 3 times of Sindhu’s age before 10 years.

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