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A is 6 years older than B. Four years from now, the ratio of their ages will be 5 : 4. Find B's present age (in years).

Competition practiceRatio, Proportion & Mixtures
  • A16
  • B26
  • C24
  • D20

Step-by-Step Solution

, so . Cross-multiplying: , giving .
Answer: D) 20

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