What is Priya’s present age? Statement I: Priya’s present age is 2/5 of her mother’s age. Statement II: Priya’s mother's age will be thrice Neha’s age after 5 years. Statement III: Neha’s seventeenth birthday was celebrated three years before.

Statement III gives Neha's current age: her 17th birthday was 3 years ago, so she is now 20. Statement II gives the relationship: Mother's age after 5 years = 3 × Neha's age after 5 years = 3 × 25 = 75, so Mother is now 70. Statement I gives Priya = 2/5 × Mother's age = 2/5 × 70 = 28. All three statements together are necessary and sufficient to find Priya's age. No single statement or pair gives enough information.