Quantitative Aptitude प्रश्न और उत्तर का अभ्यास करें

नवीनतमलोकप्रियमूल्यांकनपेज देखें 159 of 159कुल सवाल 1267 जॉइन Examsbook

प्र: Present ages of Deepa and Hyma are in the ratio of 5:6 respectively. After four years, this ratio becomes 6: 7. What is the difference between their present ages? 941 0

  • 1
    6 yrs
    सही
    गलत
  • 2
    4 yrs
    सही
    गलत
  • 3
    8 yrs
    सही
    गलत
  • 4
    2 yrs
    सही
    गलत
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उत्तर : 2. "4 yrs"
व्याख्या :

Answer: B) 4 yrs Explanation: Let the present age of Deepa = 5p Let the present age of Hyma = 6p After four years their ratio = 6 : 7 => 5p + 46p + 4 = 67 => 35p + 28 = 36p + 24 => p = 4 Therefore, the difference between their ages = 24 - 20 = 4 years.

प्र: A person can row 8 1/2 km an hour in still water and he finds that it takes him twice as long to row up as to row down the river. The speed of the stream ? 916 0

  • 1
    1.78 kmph
    सही
    गलत
  • 2
    2.35 kmph
    सही
    गलत
  • 3
    2.83 kmph
    सही
    गलत
  • 4
    3.15 kmph
    सही
    गलत
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उत्तर : 3. "2.83 kmph"
व्याख्या :

Answer: C) 2.83 kmph Explanation: Given speed of the person = 8 1/2 = 17/2 kmphLet the speed of the stream = x kmphspeed of upstream = 17/2 - xspeed of downstream = 17/2 + xBut given that,2(17/2 - x) = 17/2 + x=> 3x = 17/2=> x = 2.83 kmph.

प्र: A can complete a work in 12 days with a working of 8 hours per day. B can complete the same work in 8 days when working 10 hours a day. If A and B work together, working 8 hours a day, the work can be completed in --- days  ? 883 0

  • 1
    51/24
    सही
    गलत
  • 2
    87/5
    सही
    गलत
  • 3
    57/12
    सही
    गलत
  • 4
    60/11
    सही
    गलत
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उत्तर : 4. "60/11"
व्याख्या :

Answer: D) 60/11 Explanation: A can complete the work in 12 days working 8 hours a day => Number of hours A can complete the work = 12×8 = 96 hours  => Work done by A in 1 hour = 1/96   B can complete the work in 8 days working 10 hours a day => Number of hours B can complete the work = 8×10 = 80 hours  => Work done by B in 1 hour = 1/80   Work done by A and B in 1 hour = 1/96 + 1/80 = 11/480  => A and B can complete the work in 480/11 hours   A and B works 8 hours a day. Hence total days to complete the work with A and B working together  = (480/11)/ (8) = 60/11 days

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