Mixed Quantitative Aptitude Questions Set 128

Directions(1-5): Find the approximate value of the following questions.

1. 56% of 225 + 20% of 150 = ? – 109
   222
   252
   200
   265
   290
   Option D
   56% of 225 + 20% of 150 = ? – 109
   =>? = 126 + 30 + 109 = 265

    

2. 0.5% of 674 of 0.8% of 225 = ?
   8
   4
   6
   5
   2
   Option C
   0.5% of 674 of 0.8% of 225 = ?
   =>? = 0.5/ 100 × 674 × 0.8/ 100 × 225
   = 6.066 == 6

    

3. 36% of 170 + ? % of 592 = 150
   10
   15
   20
   25
   30
   Option B
   36%of 170+? %of 592 = 150
   =>61.2+?× 5.92 = 150
   => ? = 88.8/5.92 = 15

    

4. (42)^2 ÷ 6.3 x 26 =?
   7447
   7280
   7117
   7700
   7220
   Option B
   (42)^2 ÷ 6.3 x 26 =?
   =>? = 280 × 26 = 7280

    

5. (1125—274—323)÷(875—654— 155) =?
   12
   8
   18
   16
   10
   Option B
   (1125—274—323)÷(875—654— 155) =?
   =>528 ÷ 66 = 8

    

6. The simple interest on a certain sum at 15% per annum for 5 year is Rs1500 more to the simple interest on the same at 12% per annum for the same period. Find the sum.
   Rs. 10000
   Rs. 30000
   Rs. 60000
   Rs. 40000
   Rs. 20000
   Option A
   75% of P – 60% of P = 1500
   P = Rs. 10000

    

7. The total of the ages of a class of 60 girls is 900 years. The average age of 20 girls is 12 years and that of the other 20 girls is 16 years. What is the average age of the remaining girls?
   13 years
   17 years
   19 years
   15 years
   11 years
   Option B
   20* 12 + 20* 16 + 20x = 900
   =>20x = 900 − 240 − 320 =>20x = 340
   =>x = 17 years

    

8. In a mixture of 40 litre, the ratio of milk and water is 4 : 1. If some quantity of mixture taken out and then 4 litre of milk and 4 litre of water is added to the mixture then the ratio of milk and water become 8 : 3. Find the quantity of mixture which was taken out initially ?
   12 L
   18 L
   15 L
   19 L
   10 L
   Option C
   Milk = 4/5*40 = 32 L
   Water = 1/5*40 = 8 L
   [32 – 4/5*x+4]/[8 – 1/5*x+4] = 8/3
   =>x = 15 L

    

9. A boat takes 6 min more to cover 21 km downstream when the river flowing at the speed of x km/hr then the time taken to cover the same distance downstream when the river flowing at the rate of (x+1)km/hr. find the value of if the speed of boat in still water is 12 km/hr ?
   6 km/hr.
   4 km/hr.
   3 km/hr.
   5 km/hr.
   2 km/hr.
   Option E
   21/(x+12)-21/(x+13) = 6/60
   =>x^2 + 25 -54 = 0
   =>x = 2 km/hr.

    

10. There are 36 tickets numbered from 1 to 36. If two tickets are drawn at random without replacement one by one than find the probability that both tickets have a number which is multiple of 5 ?
    1/20
    1/25
    1/40
    1/36
    1/30
    Option E
    Required probability = 7/36*6/35 = 1/30