IBPS Government Jobs Exams Numerical Ability Alligation or Mixture

How many litres of a solution that has 30 percent salt must be added to a 50 liters that has 10 percent salt so that the resulting solution has 20 percent salt?
A)20 B)30 C)40 D)50 E)60

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IBPS Other Question

A train leaves from Bombay at 6:30 AM and reaches Jaipur at 10:30 AM. Another train leaves from Jaipur at 9 AM and reaches Delhi at 12:30 PM. When they will meet?
A)9:42 AM B)10:06 AM C)9:24 AM D)10:12 AM E)None of these If johnny can finish certain work in 30 minutes. With the help of his brother, Bobby, they do the work in 20 minutes. How long would it take Bobby working alone to finish the work ?
A)1/2 hour B)3/4 hour C)1 hour D)3/2 hours E)2 hours