Mathematical Aptitude - Ratio Proportion, Percentage and Discounting

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6. A man spends Rs 3500 and saves 12 1/2 % of his income. His monthly income (in Rs ) is

  • Option : B
  • Explanation : (100 – 12.5)%, i.e., 87.5% of total income = 3500,
    total income = 3,500 × 100/87.5 = 4000
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8. X’s salary is half that of Y. If X got a 50% rise in his salary and Y got a 25% rise in his salary, then the percentage increase in combined salaries of both is

  • Option : B
  • Explanation : Let Y’s salary = 100, then X’s salary = 50
    X’s new salary = 50 × 3/2 = 75
    Y’s new salary = 100 × 5/4 = 125
    Combined old salary = 100 + 50 = 150
    New combined salary = 75 + 125 = 200
    Increase in combined salary = 50
    Percentage increase = 50/150 × 100 = 33.33%
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9. A mixture of 40 l of milk and water contains 10% water. How much water should be added to it so that water may be 20% in the new mixture?

  • Option : A
  • Explanation : Let x water to be added to make water 20% of new mixture.
    Water in old mixture = 10% of 40 = 4 l
    Water in new mixture to make it 20% = (4 + x) l
    Now 20% of (40 + x) l = 4 + x
    Solving equation, we get x = 5 l.
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10. A man spends 75% of his income. His income is increased by 20% and he increased his expenditure by 10%. His savings increased by

  • Option : D
  • Explanation : Let income = 100
    New income = 120
    New expenditure = 75 + 10% of 75 = 82.5%
    New savings = 120 − 82.5 = 37.5
    Old saving = 25,
    Percentage increase in savings
    = (37.5 − 25)/25 × 100
    = 12.5/25 × 100 = 50%
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  • Ratio Proportion Questions can be used to give quizzes by any candidate who is preparing for UGC NET Paper 1
  • This Ratio Proportion Questions section will help you test your analytical skills in a tricky method, thereby giving you an edge over other students
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  • Ratio Proportion Questions for UGC NET Papeer 1

    Ratio Proportion MCQ

    Ratio Proportion Multiple choice questions