# 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