# Mixed Quantitative Aptitude Questions Set 76

1. The sum of the length of two trains A and B is 638 m. The ratio of the speed of A to that of B is 6 : 7. The ratio of the time to cross an electric pole by train A to that by B is 5 : 4. Find the difference the length of the two trains.
18
20
15
22
10
Option D
Ratio of speeds = 6 : 7
Ratio of time = 5 : 4 Ratio of length = 6 * 5 : 7 * 4
= 15 : 14
Now , 15 + 14 = 29 == 638
=> 1 = 22
Hence , the length between the two trains = 22

2. The sum of the present ages of P, Q, R and S is 85 years. After 5 years the ratio of their ages become 2:4:3:6. What is the Qâ€˜s present age?
23 years
25 years
30 years
35 years
40 years
Option A
Sum of their ages = (2x+4x+3x+6x) â€“ 5*4 = 85
=> 15x â€“ 20 = 85
=> x = 7
Qâ€™s age = 28 years
Present age of Q = 23 years

3. A mixture of milk and water in container 28 litre milk and 12 litre water. X litre milk and water are added to form a new mixture. If 30% of the new mixture is 18 litre , then find the value of x ?
8
17
10
21
12
Option C
30% == 18 litre
=> 100% = (18/30)*100 = 6 litre
Now, 28 + x + 12 + x = 60
=> 2x = 20
=> x = 10

4. The marked price of A is Rs 1100 more than its cost price. When a discount of Rs 400 is allowed a profit of 20% is earned. At what price should A be sold to earn a 25% profit?
Rs.4250
Rs.4375
Rs.3520
Rs.1522
Rs.1570
Option B
Let CP be x .
Then, MP = x + 1100
SP = x + 1100 â€“ 400
= (x*120)/100
=> x = 3500
Now, SP = 3500 *(125/100) = Rs. 4375

5. The tens digit of a three digit number is 2. If the digits at units and hundreds places are interchanged then the number thus formed is 594 more than the previous one. Also the sum of the units digit and hundreds digits is 12. Then what is the number?
300
333
329
420
400
Option C
Let units digit be x , tens digit be y and hundred digits be z.
Then, number = 100z + 10y + x
Given that , y = 2 x + z = 12 ——(1)
Now, (100x + 10y + z) â€“ (100z + 10y – x)
= 594 99x â€“ 99z = 594 x â€“ z = 6 ——-(2)
On solving (1) and (2), we get
2x = 18
=> x = 9 x = 9, z = 3
Hence , the required number is = 100* 3 + 10*2 + 9
= 300 + 20 + 9 = 329

6. A alone can do a piece of work in 30 days. The time taken by A in completing 1/6 of the work is equal to the time taken by B in completing 1/4 of the work. In what time will A and B together complete the work?
20 days
13 days
18 days
25 days
12 days
Option E
A can do (1/6) of the work = 30 /6 = 5 days
work is completed by B in (5*4) = 20 days
(A+B) together complete the work in (30+20)/(600)
= 600/50 = 12 days

7. The average age of the employee in a company is 23.5 years. And the average of the males in the company is 25.2 years and that of the females is 23.2 years. Find the ratio of the number of males to the number of females in the company .
3:17
2:11
1:7
10:13
5:19
Option A
Male ======= Female
25.2 ====== 23.2
=======23.5
0.3 : 1.7
3:17

8. A boat covers 72 km downstream in 6 hours. If the speed of the current is (1/3) of its downstream speed, in what time will it cover a distance of 200 km upstream?
20 hrs.
30 hrs.
60 hrs.
50 hrs.
40 hrs.
Option D
Downstream speed = 72/6 = 12km
Speed of the current = 12/3 = 4km/hr.
Speed of boat = 12-4 = 8km/hr.
Now, downstream speed = 8 â€“ 4 = 4 km/hr.
Time = 200/4 = 50 hrs.

9. The ratio of the cost price to the selling price of an article is 10: 12. If 25% discount is offered on the marked price of the article then the marked price is what percent more than the cost price?
42%
60%
30%
25%
55%
Option B
Let Cp be 10x and SP be 12x.
Now, MP = (12x *100)/75 = 16x
Required % = [(16x â€“ 10x)*100]/10x = 60%

10. The difference between the interest received by Anil and Ravi is Rs 120. When they invest Rs 2000 each for 3 years what is the difference in the rate of interest?
2%
7%
4%
9%
6%
Option A
S1 â€“ S2 = (P*R1*T)/100 â€“ (P*R2*T)/100
=>120 = [(P*T)(R1 â€“ R2)]/100
=> R1 â€“ R2 = 2%

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