As there are a plenty of topics to cover in Quantitative Aptitude section, so you have to practice much harder. The questions from this section may or may not be difficult, but lengthy and require time. There are 25 questions in aptitude section. Therefore, to solve all of them, you have to be very fast and allocate time accordingly
Please find SSC CHSL 2017 quantitative aptitude questions of question paper held on 21 Jan 2017.
Question 1. Triangle ABC is right angled at B. BD is the altitude. AD is 8cm and DC is 18 cm. Find length of BD?
(a) 6 cm
(b) 9 cm
(c) 12 cm
(d) 15 cm
Ans.:c.
Explanation:
Suppose, the length of BD = x cm.
The line of altitude is always perpendicular to line AC.
In triangle ABD,
AB^{2} = AD^{2} + BD^{2};
AB^{2 }= 8^{2} + x^{2}; ……………(i)
In triangle BCD,
BC^{2} = BD^{2} + CD^{2};
BC^{2} = x^{2} + 18^{2}; ……………(ii)
In triangle ABC,
AB^{2} + BC^{2} = AC^{2};
Put the value from eq. (i) and eq. (ii) in it.
64 + 324 + 2x^{2} = 26^{2};
388 + 2x^{2} = 676;
x^{2} = 144; => x= 12 cm.
Question 2. Painter ‘A’ can paint a house in 50 days and ‘B’ can do it in 25 days. With help of ‘C’, they did the job in 10 days only. Then, ‘C’ alone can do the job in
(a) 8 days
(b) 16 days
(c) 25 days
(d) 15 days
Ans.:c.
Explanation:
1 day work of A= (1/50);
1 day work of B = (1/25);
1 day work of (A +B + C) = (1/10);
Hence, the 1 day work of C alone = 0.1 – 0.04 – 0.02 = 0.04.
Therefore, C will take = 1/0.04= 25days to get work done.
Question 3. If 4 + 2x ≤ 6 + x and 2x + 5 < 2 + 4x; then x can take which of the following values?
(a) 3
(b) 1
(c) 0
(d) 2
Ans.:d.
Explanation:
4 + 2x <=6  (i.)
2x + 5 < 2 + 4x  (ii.)
Subtracting eq. (i) from eq. (ii);
1 < 4x 4;
4x > 5; => x > 1.25;
Question 4. What are the roots of the quadratic equation 4x^{2} + 6x – 18 = 0?
(a) 3, 3
(b) 3, 6
(c) 3/2, 3
(d) 3, 3
Ans.:c.
Explanation:
4x^{2} + 6x – 18 = 0;
2x^{2} + 3x – 9 = 0;
2x^{2} + 6x – 3x – 9 = 0;
2x (x + 3) 3 (x + 3) =0;
(x +3)* (2x – 3)=0;
x= 3, 3/2;
Question 5. The price of an article is cut by 21%, to restore to its original value, the new price must be increased by
(a) 21 percent
(b) 26.58 percent
(c) 17.36 perent
(d) 26.25 percent
Ans.:b.
Explanation: Suppose the price of an article = Rs. x;
New price = 79% of x; => 0.79x;
% increase = (0.21/0.79)*100;
= 26.58%.
Question 6. If Gafur’s salary is 4/3 times of Haashim’s and Satish’s is 5/4 times of Haashim’s, what is the ratio of Gafur’s salary to Satish’s?
(a) 16 : 15
(b) 3 : 5
(c) 5 : 3
(d) 15 : 16
Ans.:a.
Explanation:
Salary of Gafur = 4/3 * Salary of Haashim;
Salary of Satish = 5/4 * Salary of Haashim;
Salary (Gafur) : Salary (Satish) = [4/3]/[5/4] = 16/15.
Question 7. If cosecA/(cosecA – 1) + cosecA/(cosecA + 1) = x, then x is
(a) 2cosec^{2}A
(b) 2cosecA
(c) 2secA
(d) 2sec^{2}A
Ans.:d.
Explanation:
Question 8. Which of the following is correct?
(a) (2x – y)^{2} = 4x^{2} – 4xy + y^{2}
(b) (2x – y)^{2} = x^{2} – 4xy + 4y^{2}
(c) (2x + y)^{2} = x^{2} – 4xy + 4y^{2}
(d) (2x + y)^{2} = 4x^{2} – 4xy + y^{2}
Ans.:a.
Explanation:
(2xy)^{2}= 4x^{2}+y^{2}4xy;
(2x – y)^{2} = 4x^{2} – 4xy + y^{2};
Question 9. Of the 3 numbers whose average is 77, the first is 3/4 times the sum of other 2. The first number is
(a) 148
(b) 66
(c) 99
(d) 198
Ans.: c.
Explanation: Let these numbers are a, b, and c.
a + b + c = 77*3 = 231; (i)
a = ¾* (b + c);  (ii)
replacing b + c value in eq.(i);
a + 4/3*a = 231;
7a/3 = 231; => a = 33 * 3=99.
Question 10. If the amount received at the end of 2^{nd} and 3^{rd} year at Compound Interest on a certain Principal is Rs 34992, and Rs 37791.36 respectively, what is the rate of interest?
(a) 4 percent
(b) 16 percent
(c) 8 percent
(d) 13 percent
Ans.:c.
Explanation: By the compound interest formula
Question 11. Slope of the side DA of the rectangle ABCD is 3/4. What is the slope of the side AB?
(a) 4/3
(b) 3/4
(c) 3/4
(d) 4/3
Ans.:d.
Explanation: In a rectangle ABCD, line DA and AB will be perpendicular to each other.
Slope (DA) * Slope (AB) = 1;
Slope (AB) = 1/(3/4)=4/3;
Question 12. If cot 30^{} – cos 45^{} = x, then x is
(a) √3 + 2
(b) (√61)/√2
(c) (√32√2)/√6
(d) (1+√2)/2
Ans.:b.
Explanation: cot 30^{} – cos 45^{} = x;
Replacing the value of these trigonometric measures
√3 – 1/√2 =x;
x = (√61)/√2;
Question 13. The length of the diagonal of a rectangle is 10 cm and that of one side is 8 cm. What is the area of this rectangle?
(a) 80 sq cm
(b) 48 sq cm
(c) 60 sq cm
(d) 32 sq cm
Ans.:b.
Explanation:
Suppose that AC = 10 cm and AB = 8cm.
Since, triangle ABC is a rightangled triangle.
AC^{2} = AB^{2} + BC^{2};
BC^{2} = 10^{2} – 8^{2};
BC^{2} = 36;
BC = 6;
The Area of Rectangle = AB x BC;
=8*6
=48 sq. cm.
Question 14. The two numbers are 55 and 99, HCF is 11, What is their LCM?
(a) 486
(b) 479
(c) 476
(d) 495
Ans.:d.
Explanation:
HCF x LCM = first number x second number;
LCM = 55 x 99 /11 = 55 * 9 = 495.
Question 15. A dishonest milkman buys milk at Rs 25 per litre and adds 1/5 of water to it and sells the mixture at Rs 29 per litre. His gain is
(a) 16 percent
(b) 39.2 percent
(c) 24 percent
(d) 32 percent
Ans.:b.
Explanation: Suppose that he bought 10 litre of Milk and add 2 litre water into it.
Then, the price of 10 litre milk = Rs. 250;
The price of Milk and water mixture = 12 *29 = Rs. 348;
Realized gain = (348250/250)*100 = 39.2%.
Question 16. If 9x – 6y = 15 and x + 6y = 15, then the value of x and y.
(a) 3, 4
(b) 3, 2
(c) 4, 5
(d) 5, 6
Ans.:b.
Explanation:
9x 6y = 15 (i)
x + 6y = 15 (ii)
Add both the equations,
10x=30; => x=3 and y = 2.
Question 17. A cone of height 25 cm and diameter 21 cm is mounted on a hemisphere of the same diameter. Find the volume of the solid thus formed? (Take π = 22/7)
(a) 3155 cubic cms
(b) 4158 cubic cms
(c) 3315 cubic cms
(d) 5313 cubic cms
Ans.:b.
Explanation:
Question 18. To cover a distance of 297 km in 4.4 hours what should be the average speed of the car in meters/second?
(a) 67.5 m/s
(b) 33.75 m/s
(c) 37.5 m/s
(d) 18.75 m/s
Ans.:d.
Explanation:
Speed = Distance/time;
= 297/4.4 = 67.5 kmph;
= > (67.5*5)/18 = 18.75 m/sec.
Question 19. The diameter of a circle is equal to the side of the square. What is the area of the square if the area of the circle is 36π sq cm?
(a) 72 sq cm
(b) 144 sq cm
(c) 36 sq cm
(d) 18 sq cm
Ans.:b.
Explanation: Suppose, the diameter of circle = side of square =2a cms.
Area of Circle = ��a^{2} = 36π; => a = 6;
Hence, the area of square = 4a^{2}=4*36 = 144 sq. cm.
Question 20. Marked price of an item is Rs 100. On purchase of 2 items discount is 25%, on purchase of 4 items discount is 43%. Rajasi buys 6 items, what is the effective discount?
(a) 37 percent
(b) 26.25 percent
(c) 9.6 percent
(d) 24.6 percent
Ans.:a.
Explanation:
2* 100 (25%)> Rs. 150 (After discount);
4*100 (43%) > Rs. 228 (After discount);
If she purchased 6 items;
6*100  > Rs. 378 (after discount);
Discount percentage = [(600378)/600]*100 = 37%.
Question 21. If tan2A = x, then x is
(a) 2tanA/(1 – tan^{2}A)
(b) (1 – tan^{2}A)/2tanA
(c) 2tanA/(1 + tan^{2}A)
(d) (tan^{2}A – 1)/2tanA
Ans.:a.
Explanation:
tan2A =(2*tanA)/(1tan^{2}A);
Question 22. Refer the below data table and answer the following Question.

Quantity of stock 
Average Cost (Rs) 
Mobile Phones 
40 
10000 
Cameras 
93 
20000 
TVs 
97 
52000 
Refrigerators 
21 
22000 
ACs 
39 
23000 
What is the value of the total stock (in lakh rupees)?
(a) 866.3
(b) 127
(c) 290
(d) 86.63
Ans.:d.
Explanation:
Value of total stock = 40*10000 + 93*20000 + 97*52000 + 21*22000 + 39*23000;
= 4 lacs + 18.6 lacs + 50.44 lacs + 4.62 lacs + 8.97 lacs
=86.63 lacs.
Question 23. Refer the below data table and answer the following Question.
Year 
Ratio Import/Export 
2011 
0.8 
2012 
1.2 
2013 
0.8 
2014 
1.4 
2015 
0.8 
If the imports in 2012 was Rs. 1000 crores and the total exports in the years 2012 and 2013 together was Rs. 3600 crores, then the imports in 2013 was?
(a) 2767
(b) 2213
(c) 833
(d) 3458
Ans.:b.
Explanation: Suppose the imports in 2013 was = Rs. x crores.
Export in 2012= 1000/1.2 = 833.33 crores.
Export in 2013 = 3600 – 833.33 = 2766.67 crores.
Import in 2013 = 2766.67*0.8=2213.336 crores.
Question 24. Refer the below data table and answer the following Question.
Measured on Birthday 
Height of the child (in cms) 
4 
100 
5 
110 
6 
115 
7 
120 
8 
125 
9 
135 
10 
140 
11 
150 
12 
160 
13 
170 
14 
175 
15 
185 
16 
195 
What was the increase in the height of the child from the 7^{th} Birthday to the 15^{th} Birthday?
(a) 75 cms
(b) 70 cms
(c) 65 cms
(d) 60 cms
Ans.:c.
Explanation:
Increased height = 185120 = 65 cms.
Question 25. Refer the below data table and answer the following Question.
Deep Sleep 
5 min 
Dreaming 
10 min 
Light sleep 
10 min 
Extremely light sleep 
20 min 
Awake 
55 min 
Between 10 pm to 6am, a fitness band records the following data. How long was the user dreaming or was awake?
(a) 3.7 hours
(b) 4.7 hours
(c) 5.2 hours
(d) 5.7 hours
Ans.:
Explanation:
Duration for which user is dreaming or awake = 55 + (20 +55) + (10 + 20 + 55) + (10 + 10 + 20 +55)
= 55 + 75 + 85 + 95
= 310 min 5.2 hours.