# Mixed Quantitative Aptitude Questions Set 126

1. 5, 8, 12, 18, 27, ?
50
60
40
70
20
Option C
Difference of difference
? = 40

2. 142, 133, 115, 88, ?
52
44
60
38
76
Option A
-9,-18,-27,-36
? = 52

3. 2, 10, 30, 68, 130, ?
200
150
165
188
222
Option E
Difference of difference
? = 222

4. 3, 8, 18, 38, 78, ?
161
158
170
153
165
Option B
+5,+10,+20,+40,+80
? = 158

5. 6, 3, 3, 6, 24,?
184
177
164
192
189
Option D
*0.5,*1,*2,*4,*8
? = 192

6. A boat goes 30 km downstream and 18 km upstream in 6 hours, again it goes 40 downstream and 20 km upstream in 22/3 hours. Find speed of boat.
10
7
8
9
6
Option C
Let speed of boat = u kmph And speed of flow = v kmph
According to question 18/( u – v) + 30/( u + v) = 6 … . (i)
20/( u – v) + 40/( u + v) = 22/ 3 … (ii)
On solving the equation We get u = 8 kmph, v = 2 kmph

7. A vessel contains mixture of milk and water in which water concentration is 30%. If 20% water and 30% milk is taken out and replaced with equal quantity of water, then quantity of water increases by what percent of the initial quantity of water in the mixture.
60%
40%
50%
70%
80%
Option D
Required % = [30/100 × 70]/30 × 100 = 21/30 × 100 = 70%

8. The ratio of income of A, B and C is 3 : 7 : 4 and the ratio of their expenditure is 4 : 3 : 5 respectively. If A saves Rs 300 out of Rs 2400, find the savings of C.
500
444
525
480
625
Option C
Salary of A = 3x = Rs 2400
Salary of B = 7x = Rs 5600
Salary of C = 4x = Rs 3200
Expenditure of A, B and C = 4y, 3y & 5y respectively.
Saving of A is 300 Expenditure = 4y = (2400 – 300) = 2100
y = 2100/4 = 525

9. A, B and C can finish a work in 10, 12 and 15 days respectively. They start working together. If B stops after 2 days, how long would it take A and C to finish the remaining work?
2
4
5
3
6
Option D
A + B + C in 2 days, do 2 ( 1/10 + 1/ 12 + 1/ 15) = 1/2 work
Now, B withdraws, A + C will do the whole work in (10×15)/( 15+10) = 6 days
It will take 6/2 i.e. 3 more days

10. The marked price of a radio is Rs 480. The shopkeeper allows a discount of 10% and still gains 8%. If no discount is allowed, find his gain percent.
30%
20%
50%
40%
60%
Option B
M. P. = Rs 480/-
Discount = 10%
S.P. = 90/100 × 480 = Rs. 432
P% = 8% C.P. = 100/108 × 432 = 400
If no discount is given then S.P. = M.P. i.e. S.P. = 480 ?
P% = S. P. −C. P. /C. P. × 100
480 – 400/400 × 100 = 80/400 × 100 = 20%