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Answer:

- Ratio of Sumati's age and Sudha's age is 3:5. After 10 years the ratio of their ages becomes 2:3.

- Sudha's present age = ?

Let present age of Sumati be be 3x and present age of Sudha be 5x.

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Cross multiplying both the sides we get :

Transferring the constant to LHS and variable based expression to RHS.

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