Previous Year Questions
SSC-CGL Exam
1. Number System
The LCM of two numbers is 180 and their HCF is 12. If one number is 36, find the other.
View Answer
Other number = (LCM × HCF)/given number = (180×12)/36
60
Unit digit of 3¹²⁵ + 7¹²⁵?
View Answer
3 powers: 3,9,7,1 → 125 mod 4 =1 → 3¹²⁵=3
7 powers: 7,9,3,1 → 7¹²⁵=7 → Sum=3+7=10
Unit digit = 0
2. Percentage
A trader marks price 20% above CP. If he allows 10% discount, find profit %.
View Answer
CP=100 → MP=120 → SP=120×0.9=108 → Profit=8
8%
Population increased from 1,00,000 to 1,20,000 → Find % increase.
View Answer
(120000−100000)/100000×100
20%
3. Profit, Loss & Discount
A sold an article at 20% profit. If he had sold it for ₹200 more, profit would be 40%. Find CP.
View Answer
1000
A trader buys 10 kg sugar @ ₹40/kg, sells 8 kg @ ₹50/kg → Gain/Loss?
View Answer
CP=400, SP=8×50=400
No profit/loss
4. Simple & Compound Interest
SI on ₹5000 for 2 years at 8% p.a.?
View Answer
SI=(5000×8×2)/100
800
CI: ₹2000 at 10% p.a. for 2 years?
View Answer
Year1: 2000×0.1=200 → 2200
Year2: 2200×0.1=220 → Total=2420
2420
5. Ratio & Proportion
Divide ₹480 in ratio 3:5?
View Answer
480×3/8=180, 480×5/8=300
180 and 300
A: ₹6000, B: ₹9000 → Profit ₹1500 → Share of B?
View Answer
6000:9000=2:3 → B's share=1500×3/5
900
6. Average
Average of 5 numbers 12,15,18,20,x=16 → Find x
View Answer
Sum=5×16=80 → 12+15+18+20=65 → x=80−65
15
Weighted average: 3 students scored 80, 4 students scored 90 → Find average
View Answer
(3×80 + 4×90)/7 = (240+360)/7=600/7
≈85.71
7. Time, Speed & Distance
A car travels 180 km in 3 hr → Speed?
View Answer
180/3
60 km/h
Two trains 120 km apart → Speeds 40 km/h & 60 km/h → Meet in?
View Answer
Time=120/(40+60)=1.2 hr
1 hr 12 min
8. Time & Work
A: 12 days, B: 15 days → Together?
View Answer
1/12+1/15=9/60 → 60/9
6.67 days
Pipe fills tank in 20 hr, emptying pipe 30 hr → Net time?
View Answer
1/20−1/30=1/60
60 hours
9. Algebra
Solve: x²−7x+10=0
View Answer
x=2,5
Simplify: (x²−16)/(x−4)
View Answer
x+4
14. Data Interpretation
Table: Boys=100, Girls=150 → % Boys?
View Answer
100/(100+150)
40%
Line graph: Profit Jan=5, Apr=10 → % increase?
View Answer
(10−5)/5×100
100%
15. Data Sufficiency
Find x:
1. x+6=10
2. x−2=6
View Answer
Statement1: x=4 → sufficient
Statement2: x=8 → sufficient
Option 4: Each alone sufficient
16. Miscellaneous (P&C, Probability, Simplification)
Arrange 3 letters from A,B,C,D?
View Answer
4P3=24
Pick 2 letters from A,B,C,D → Combinations?
View Answer
4C2=6
Probability of rolling even number on die?
View Answer
3/6
1/2
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