Book Maths Puzzle

The ages of Neha and Kavita are in the ratio of 7:5. Ten years hence, the ratio of their ages will be 9:7. Find their present ages.

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Book Other Question

50kg of an alloy of lead and tin contains 60% of lead. How much lead must be melted into it to make the alloy contain 75% of lead? After 12 years Kuldeep will be 3 tines as old as he was 4 years ago. Find his present age.