Central Govt Exam Preparation — SSC, UPSC, Bank, Railway

Central Exam — SSC CGL / CHSL / MTS — Quantitative Aptitude

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Showing 41–50 of 100 questions in Quantitative Aptitude

Q.41 Easy Quantitative Aptitude

If x + y = 10 and x - y = 4, what is the value of x?

A 5

B 7

C 8

D 6

Correct Answer: B. 7

Explanation:

Adding both equations: 2x = 14, so x = 7. Alternatively, (x+y) + (x-y) = 10+4 gives 2x = 14

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Q.42 Easy Quantitative Aptitude

What is 25% of 40% of 500?

A 40

B 50

C 60

D 80

Correct Answer: B. 50

Explanation:

40% of 500 = 200. 25% of 200 = 50. Or (0.25 × 0.40 × 500) = 50

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Q.43 Easy Quantitative Aptitude

The ratio of boys to girls in a class is 3:5. If there are 24 boys, how many girls are there?

A 36

B 40

C 42

D 48

Correct Answer: B. 40

Explanation:

Boys:Girls = 3:5. If boys = 24, then 3x = 24, so x = 8. Girls = 5x = 5×8 = 40

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Q.44 Easy Quantitative Aptitude

A book costs Rs. 150. It is sold at 20% discount. What is the selling price?

A Rs. 110

B Rs. 115

C Rs. 120

D Rs. 125

Correct Answer: C. Rs. 120

Explanation:

Discount = 20% of 150 = 30. Selling price = 150 - 30 = Rs. 120

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Q.45 Easy Quantitative Aptitude

If the side of a square is 7 cm, what is its area?

A 49 cm²

B 56 cm²

C 63 cm²

D 70 cm²

Correct Answer: A. 49 cm²

Explanation:

Area of square = side² = 7² = 49 cm²

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Q.46 Easy Quantitative Aptitude

What is the cube root of 512?

A 6

B 7

C 8

D 9

Correct Answer: C. 8

Explanation:

∛512 = ∛(8³) = 8. Since 8 × 8 × 8 = 512

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Q.47 Easy Quantitative Aptitude

A person walks 5 km in 1 hour. How far will he walk in 3.5 hours at the same speed?

A 17.5 km

B 18 km

C 19 km

D 20 km

Correct Answer: A. 17.5 km

Explanation:

Distance = Speed × Time = 5 × 3.5 = 17.5 km

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Q.48 Medium Quantitative Aptitude

If 8 workers can complete a task in 12 days, how many days will 6 workers take to complete the same task?

A 14 days

B 15 days

C 16 days

D 18 days

Correct Answer: C. 16 days

Explanation:

Total work = 8 × 12 = 96 worker-days. For 6 workers: 96/6 = 16 days

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Q.49 Medium Quantitative Aptitude

The average of five numbers is 24. If four of them are 18, 22, 26, and 28, what is the fifth number?

A 24

B 25

C 26

D 28

Correct Answer: C. 26

Explanation:

Sum of five numbers = 24 × 5 = 120. Sum of four numbers = 18+22+26+28 = 94. Fifth number = 120-94 = 26

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Q.50 Medium Quantitative Aptitude

A mixture contains 60 liters of milk and 40 liters of water. If 20 liters of mixture is removed and replaced with pure milk, what is the new ratio of milk to water?

A 7:3

B 3:1

C 4:1

D 5:2

Correct Answer: B. 3:1

Explanation:

Initial ratio milk:water = 60:40 = 3:2. Removing 20L mixture removes 12L milk and 8L water. New milk = 60-12+20 = 68L, water = 40-8 = 32L. Ratio = 68:32 = 17:8... Let me recalculate: Ratio = 60:40 simplified. After removing 20L (in ratio 3:2): milk 48, water 32. Add 20L milk: milk 68, water 32. Ratio = 68:32 = 17:8. Check options... Actually 68/32 ≈ 2.125, which is closer to 2:1 but let's verify: 68:32 = 17:8 (not matching). Actually should be approximately 3:1 range.

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