Central Exam — SSC CGL / CHSL / MTS — Quantitative Aptitude
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Showing 21–30 of 100 questions
in Quantitative Aptitude
Q.21
Easy
Quantitative Aptitude
The average of 5 numbers is 24. What is their sum?
Correct Answer:
A. 120
Explanation:
Sum = Average × Number of values = 24 × 5 = 120
Q.22
Easy
Quantitative Aptitude
If the ratio of boys to girls in a class is 3:4 and there are 12 boys, how many girls are there?
Correct Answer:
A. 16
Explanation:
Boys:Girls = 3:4. If boys = 12, then 3 units = 12, so 1 unit = 4. Girls = 4 × 4 = 16
Q.23
Easy
Quantitative Aptitude
What is 25% of 480?
Correct Answer:
A. 120
Explanation:
25% of 480 = (25/100) × 480 = 120
Q.24
Easy
Quantitative Aptitude
A train travels 360 km in 6 hours. What is its speed in km/h?
Correct Answer:
A. 60
Explanation:
Speed = Distance/Time = 360/6 = 60 km/h
Q.25
Easy
Quantitative Aptitude
If 40% of x is 240, what is the value of x?
Correct Answer:
A. 600
Explanation:
40% of x = 240 → (40/100) × x = 240 → x = 600
Q.26
Medium
Quantitative Aptitude
A man buys a watch for Rs. 900 and sells it for Rs. 1080. What is his profit percentage?
Correct Answer:
A. 20%
Explanation:
Profit = 1080 - 900 = 180. Profit% = (180/900) × 100 = 20%
Q.27
Medium
Quantitative Aptitude
If 2x² + 3x - 5 = 0, what is one value of x?
Correct Answer:
A. 1
Explanation:
2(1)² + 3(1) - 5 = 2 + 3 - 5 = 0. So x = 1 is a solution.
Q.28
Medium
Quantitative Aptitude
The simple interest on Rs. 2000 for 3 years at 8% per annum is
Correct Answer:
A. Rs. 480
Explanation:
SI = (P × R × T)/100 = (2000 × 8 × 3)/100 = 480
Q.29
Medium
Quantitative Aptitude
Two numbers are in the ratio 5:8. If their difference is 24, what is the larger number?
Correct Answer:
A. 64
Explanation:
Let numbers be 5x and 8x. Difference: 8x - 5x = 24 → 3x = 24 → x = 8. Larger = 8(8) = 64
Q.30
Medium
Quantitative Aptitude
If a person spends 30% of his income on food and 40% on rent, what percentage is left?
Correct Answer:
A. 30%
Explanation:
Total spent = 30% + 40% = 70%. Remaining = 100% - 70% = 30%