CDS Elementary Mathematics 2 — Questions and Answers
Question 1: If the simple interest on $500 at 6% per annum for 3 years is calculated, what is the interest amount?
- $90 (Correct answer)
- $80
- $100
- $60
Correct answer: $90
Simple Interest = (P × R × T) / 100 = (500 × 6 × 3) / 100 = $90.
Question 2: What is the sum of interior angles of a hexagon?
- 720° (Correct answer)
- 540°
- 900°
- 1080°
Correct answer: 720°
Sum of interior angles = (n − 2) × 180° = (6 − 2) × 180° = 720°.
Question 3: If 2x + 5 = 17, what is the value of x?
- 6 (Correct answer)
- 7
- 5
- 4
Correct answer: 6
2x = 17 − 5 = 12, so x = 6.
Question 4: The average of five numbers is 24. If four of them are 18, 22, 28, and 30, what is the fifth number?
- 22 (Correct answer)
- 20
- 24
- 18
Correct answer: 22
Total sum = 24 × 5 = 120; fifth number = 120 − (18+22+28+30) = 120 − 98 = 22.
Question 5: A circle has a radius of 7 cm. What is its circumference? (Use π = 22/7)
- 44 cm (Correct answer)
- 22 cm
- 154 cm
- 88 cm
Correct answer: 44 cm
Circumference = 2πr = 2 × (22/7) × 7 = 44 cm.
Question 6: What is the square root of 1764?
- 42 (Correct answer)
- 44
- 48
- 38
Correct answer: 42
42 × 42 = 1764, so √1764 = 42.
CDS Elementary Mathematics 2
If the simple interest on $500 at 6% per annum for 3 years is calculated, what is the interest amount?