Mixed Quantitative Aptitude Questions Set 130

  1. Work done by A in one day is four times the work done by B in one day, while the work done by B in one day is one-third of the work done by C in one day. C alone can complete the work in 16 days. In how many days can all the three together complete the work?
    4 days
    7 days
    9 days
    6 days
    8 days
    Option D
    C = 16 days
    B = 3*16 = 48 days
    A = 48/4 = 12 days
    All of them = 1/[1/16+1/48+1/12] = 6 days

     

  2. Three numbers are A,B and C are in the ratio 1:2:3 and their average is 600.if A is increases by 10% and B is decrease by 20%,then the average increased by 5%, C will be increase by ?
    180
    171
    162
    150
    177
    Option A
    sum of A, B and C = 600 × 3 = 1800
    A = 300, B = 600, C = 900
    Now A = 330, B = 480
    Average = 630 630 × 3 = 330 + 480 + C
    C = 1080
    C will be increased by 180

     

  3. Suhas decided to donate 15% of his salary. On the day of donation he changed his mind and donated Rs.1,650 which was 11/15th of what he had decided to donate earlier. How much is Suhas’ salary?
    Rs.1600
    Rs.1300
    Rs.1500
    Rs.1200
    Rs.1000
    Option C
    11/15*15/100*x = 1650
    =>x = Rs.1500

     

  4. A tap can empty a tank in one hour. A second tap can empty it in 30 min. If both the taps operate simultaneously, how much time is needed to empty the tank?
    50 min.
    10 min.
    40 min.
    30 min.
    20 min.
    Option E
    Required time = 1/[1/60+1/30] = 20 min.

     

  5. A and B started a business with initial investments in the ratio 5 : 7. If after one year their profits were in the ratio 1 : 2 and the period for A’s investment was 7 months, B invested the money for
    40 months
    10 months
    70 months
    50 months
    30 months
    Option B
    Let initial investments be 5x and 7x.
    Let B invested money for months y months (5x+7)/(7x*y) = ½
    =>y = 10 months

     

  6. 7802 + 132 − 8963 + 1326 =?×33
    5
    8
    9
    4
    6
    Option C
    7802 + 132 − 8963 + 1326 =?×33
    =>9260 – 8963 = ? × 33
    =>? = 297/33 = 9

     

  7. 21.9% of 650 = ? + 23.12
    115
    111
    112
    110
    119
    Option E
    21.9% of 650 = ? + 23.12 =>142.35 = ? + 23.12
    =>? = 119.23 == 119

     

  8. 14.5% of 740 – ?% of 320 = 87.3
    9
    8
    6
    5
    4
    Option C
    14.5% of 740 – ?% of 320 = 87.3
    => 107.3 – 87.3 = ?/ 100 ×320
    =>? = 20×100/320 = 6.25 == 6

     

  9. 85% of 420 + ?% of 1080 = 735
    32
    30
    31
    35
    36
    Option D
    85% of 420 + ?% of 1080 = 735
    =>85/ 100 ×420 + 𝑥/100 ×1080 = 735
    => x = 35

     

  10. 30% of 1225 – 64% of 555 = ?
    18
    10
    16
    14
    12
    Option E
    30% of 1225 – 64% of 555 = ?
    =>? = 367.5 – 355.2 = 12.3 ==12

     


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