CDS Elementary Mathematics 1 — Questions and Answers
Question 1: If a train travels 360 km in 4 hours, what is its speed in km/h?
- 90 (Correct answer)
- 80
- 100
- 72
Correct answer: 90
Speed = Distance / Time = 360 / 4 = 90 km/h.
Question 2: What is 15% of 240?
- 36 (Correct answer)
- 32
- 40
- 24
Correct answer: 36
15% of 240 = (15/100) × 240 = 36.
Question 3: A rectangle has length 12 cm and width 7 cm. What is its area?
- 84 sq cm (Correct answer)
- 76 sq cm
- 96 sq cm
- 38 sq cm
Correct answer: 84 sq cm
Area of rectangle = length × width = 12 × 7 = 84 sq cm.
Question 4: Simplify: (3/4) ÷ (9/16)
- 4/3 (Correct answer)
- 3/4
- 27/64
- 1/3
Correct answer: 4/3
(3/4) ÷ (9/16) = (3/4) × (16/9) = 48/36 = 4/3.
Question 5: What is the LCM of 12 and 18?
- 36 (Correct answer)
- 6
- 72
- 216
Correct answer: 36
The LCM of 12 and 18 is 36, as it is the smallest number divisible by both.
Question 6: A shopkeeper buys an item for $80 and sells it for $100. What is the profit percentage?
- 25% (Correct answer)
- 20%
- 30%
- 15%
Correct answer: 25%
Profit % = (Profit / Cost Price) × 100 = (20/80) × 100 = 25%.
CDS Elementary Mathematics 1
If a train travels 360 km in 4 hours, what is its speed in km/h?