IBPS Government Jobs Exams Numerical Ability Alligation or Mixture

The percentage of metals in a mine of lead ore is 60%. Now the percentage of silver is 3/4% of metals and the rest is lead. If the mass of ore extracted from the mine is 8000 kg, the mass (in kg) of lead is:
A)4763 B)4764 C)4762 D)4761 E)4264

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IBPS Other Question

Two pipes A and B together can fill a cistern in 4⅘ hours. Had they been opened separately, then B would have taken 4 hours more than A to fill the cistern. How many time will be taken by A to fill the cistern separately?
A)6 hours B)5 hours C)8 hours D)7½ hours E)None of these A pump can fill a tank with water in 2 hours. Because of a leak, it took 2⅔ hours to fill the tank. The leak can drain all the water of the tank in
A)9 hours B)8 hours C)10 hours D)6 hours