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