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  • Question
  • An alloy of copper and bronze weight 50g. It contains 80% Copper. How much copper should be added to the alloy so that percentage of copper is increased to 90%?


  • Options
  • A. 45 gm
  • B. 50 gm
  • C. 55 gm
  • D. 60 gm

  • Correct Answer
  • 50 gm 

    Explanation

    Initial quantity of copper = 80 100   x   50 = 40 g 

    And that of Bronze = 50 - 40 = 10 g

    Let 'p' gm of copper is added to the mixture

    => 50   +   p   x   90 100 = 40 + p

    => 45 + 0.9p = 40 + p

    => p = 50 g

    Hence, 50 gms of copper is added to the mixture, so that the copper is increased to 90%.

  • Tags: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO

    Alligation or Mixture problems


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    • 1. The milk and water in two vessels A and B are in the ratio 4:3 and 2:3 respectively. In what ratio the liquids in both the vessels be mixed to obtain a new mixture in vessel c consisting half milk and half water?

    • Options
    • A. 8:3
    • B. 6:7
    • C. 7:5
    • D. 11:7
    • Discuss
    • 2. Equal quantities of three mixtures of milk and water are mixed in the ratio 1:2, 2:3 and 3:4. The ratio of water and milk in the mixture is ?

    • Options
    • A. 193 : 122
    • B. 97 : 102
    • C. 115 : 201
    • D. 147 : 185
    • Discuss
    • 3. One type of liquid contains 25 % of benzene, the other contains 30% of benzene. A can is filled with 6 parts of the first liquid and 4 parts of the second liquid. Find the percentage of benzene in the new mixture.

    • Options
    • A. 27 %
    • B. 26 %
    • C. 29 %
    • D. 21 %
    • Discuss
    • 4. The concentration of glucose in three different mixtures (glucose and alcohol) is 12,35 and 45 respectively. If 2 litres, 3 litres and 1 litre are taken from these three different vessels and mixed. What is the ratio of glucose and alcohol in the new mixture?

    • Options
    • A. 3:2
    • B. 4:3
    • C. 2:3
    • D. 3:4
    • Discuss
    • 5. In what ratio should two varieties of sugar at Rs.18 per kg and Rs.24 Kg be mixed together to get a mixture whose cost is Rs.20 per kg?

    • Options
    • A. 1:3
    • B. 3:1
    • C. 1:2
    • D. 2:1
    • Discuss
    • 6. In what ratio must wheat at Rs. 3.20/kg be mixed with wheat at Rs. 2.90/kg so that the mixture be worth Rs. 3/kg?

    • Options
    • A. 1:2
    • B. 3:2
    • C. 2:1
    • D. 2:3
    • Discuss
    • 7. A milkman has 20 liters of milk. If he mixes 5 liters of water, which is freely available, in 20 liters of pure milk. If the cost of pure milk is Rs. 18 per litre, then the profit of the milkman, when he sells all the mixture at cost price, the profit % ?

    • Options
    • A. 22.5%
    • B. 25%
    • C. 20%
    • D. 33.33%
    • Discuss
    • 8. There are two mixtures of honey and water in which the ratio of honey and water are as 1:3 and 3:1 respectively. Two litres are drawn from first mixture and 3 litres from second mixture, are mixed to form another mixture. What is the ratio of honey and water in it ?

    • Options
    • A. 111:108
    • B. 11:9
    • C. 103:72
    • D. None
    • Discuss
    • 9. From a tank of petrol , which contains 200 liters of petrol, the seller replaces each time with kerosene when he sells 40 liters of petrol(or mixture). Everytime he sells out only 40 liters of petrol (pure or impure). After replacing the petrol with kerosene 4th time, the total amount of kerosene in the mixture is

    • Options
    • A. 81.92L
    • B. 96L
    • C. 118.08L
    • D. None of these
    • Discuss
    • 10. In what ratio must a merchant mix two varieties of oils worth Rs. 60/kg and Rs. 65/kg, so that by selling the mixture at Rs. 68.20/kg, he may gain 10% ?

    • Options
    • A. 2:3
    • B. 4:3
    • C. 3:4
    • D. 3:2
    • Discuss


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