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Mixtures & Alligations Practice Questions

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A collection of questions that typically appear from the topic mixtures and alligations in Indian Business Schools entrance tests such as XAT and TANCET. Once you have grasped the basics well, this topic is quite easy to master.

  1. A 20 litre mixture of milk and water contains milk and water in the ratio 3 : 2. 10 litres of the mixture is removed and replaced with pure milk and the operation is repeated once more. At the end of the two removal and replacement, what is the ratio of milk and water in the resultant mixture?

    1. 17 : 3
    2. 9 : 1
    3. 3 : 17
    4. 5 : 3
  2. In what ratio must a person mix three kinds of tea costing Rs.60/kg, Rs.75/kg and Rs.100 /kg so that the resultant mixture when sold at Rs.96/kg yields a profit of 20%?

    1. 1 : 2 : 4
    2. 3 : 7 : 6
    3. 1 : 4 : 2
    4. None of these
  3. A merchant mixes three varieties of rice costing Rs.20/kg, Rs.24/kg and Rs.30/kg and sells the mixture at a profit of 20% at Rs.30/kg. How many kg of the second variety will be in the mixture if 2 kg of the third variety is present in the mixture?

    1. 1 kg
    2. 5 kg
    3. 3 kg
    4. 6 kg
  4. How many litres of water should be added to a 30 litre mixture of milk and water containing milk and water in the ratio of 7 : 3 such that the resultant mixture has 40% water in it?

    1. 7 litres
    2. 10 litres
    3. 5 litres
    4. None of these
  5. How many kg of Basmati rice costing Rs.42/kg should a shopkeeper mix with 25 kg of ordinary rice costing Rs.24 per kg so that he makes a profit of 25% on selling the mixture at Rs.40/kg?

    1. 20 kg
    2. 12.5 kg
    3. 16 kg
    4. 200 kg
  6. How many litres of a 12 litre mixture containing milk and water in the ratio of 2 : 3 be replaced with pure milk so that the resultant mixture contains milk and water in equal proportion?

    1. 4 litres
    2. 2 litres
    3. 1 litre
    4. 1.5 litres
  7. A sample of x litres from a container having a 60 litre mixture of milk and water containing milk and water in the ratio of 2 : 3 is replaced with pure milk so that the container will have milk and water in equal proportions. What is the value of x?

    1. 6 litres
    2. 10 litres
    3. 30 litres
    4. None of these
  8. A zookeeper counted the heads of the animals in a zoo and found it to be 80. When he counted the legs of the animals he found it to be 260. If the zoo had either pigeons or horses, how many horses were there in the zoo? In the zoo, each horse had four legs and each pigeon had two legs.

    1. 40
    2. 30
    3. 50
    4. 60
  9. From a cask of milk containing 30 litres, 6 litres are drawn out and is replaced with water. If the same process is repeated two more times, how many litres of milk will be left in the cask?

    1. 0.512 litres
    2. 12 litres
    3. 14.38 litres
    4. 15.36 litres
  10. A 20 litres mixture of milk and water comprising 60% pure milk is mixed with "x" litres of pure milk. The new mixture comprises 80% milk. What is the value of "x"?

    1. 40 litres
    2. 20 litres
    3. 8 litres
    4. 16 litres
  11. Product M is produced by mixing chemical X and chemical Y in the ratio of 5 : 4. Chemical X is prepared by mixing two raw materials, A and B, in the ratio of 1 : 3. Chemical Y is prepared by mixing raw materials, B and C, in the ratio of 2 : 1. Then the final mixture is prepared by mixing 864 units of product M with water. If the concentration of the raw material B in the final mixture is 50%, how much water had been added to product M?

    1. 328 units
    2. 368 units
    3. 392 units
    4. 616 units
    5. None of the above

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