1 . The total age of A, B and C is 90 years. Ten years ago the ratio of their ages was 1 : 2 : 3. What is the present age of B?
- A. 40 years
- B. 30 years
- C. 20 years
- D. 18 years
- D. None of these
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দুর্নীতি দমন কমিশনের সহকারী পরিচালক-১২.০৪.২০১৩
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