Bank Exam Government Jobs Exams Numerical Ability Alligation or Mixture

When one litre of water is added to a mixture of acid and water, the mixture contains 20% acid .When one litre is added to the new mixture, then the resulting mixture contains 33 1/3%.The percentage acid in original mixture was

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A,Band C working together can complete a work in 8/3 hours. if A works at half of his speed and C works at twice his speed, the time taken to complete the work (all three still working together) remains same. if B decreases his speed by 50%, the time taken by B to complete the work becomes equal to time taken by C. Find the time taken (in hours) to complete the work if only A and C work together? 12 19 35 59 90 ?