741 Find the next number in the series: 3, 9, 27, 81, ?
Explanation
- Each term is obtained by multiplying the previous term by 3
- 81x3=243
Last verified on 25-09-2026
General Knowledge MCQs
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All MCQs in General Knowledge
742 Find the next number in the series: 2, 3, 5, 8, 13, 21, ?
Explanation
- Each term is the sum of the previous two terms (Fibonacci-like)
- 13+21=34
Last verified on 25-09-2026
743 A man’s age is 4 times that of his son. Five years ago, the man’s age was 7 times the son’s age. Find the son’s present age.
Explanation
- Let son = s, man = 4s
- (4s - 5) = 7(s - 5)
- 4s - 5 = 7s - 35
- 3s = 30 => s = 10 years
Last verified on 25-09-2026
744 Find the next number in the series: 10, 20, 30, 40, ?
Explanation
- The series follows a pattern of adding 10 each time
- 40+10=50
Last verified on 25-09-2026
745 What is the angle between the hour and minute hand of a clock at 3:00?
Explanation
- At 3:00, the minute hand is at 12 and hour hand is at 3
- Each number on clock = 30°
- Angle = 3 x 30° = 90°
Last verified on 25-09-2026
746 In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, find B’s present age.
Explanation
- A = B + 9
- (A + 10) = 2(B - 10)
- (B + 9 + 10) = 2B - 20
- B + 19 = 2B - 20
- B = 39 years
Last verified on 25-09-2026
747 Find the next number in the series: 1, 8, 27, 64, ?
Explanation
- This is a series of perfect cubes
- 1^3, 2^3, 3^3, 4^3, 5^3
- 5^3=125
Last verified on 25-09-2026
748 What is the angle between the hour and minute hand of a clock at 6:00?
Explanation
- At 6:00, the hour hand is at 6 and minute hand is at 12
- Angle = 6 x 30° = 180°
Last verified on 25-09-2026
749 Father is 3 times as old as his son. After 12 years, he will be twice as old as his son. Find the son’s present age.
Explanation
- Let son's age = x, father's age = 3x
- After 12 years: 3x + 12 = 2(x + 12)
- Solving: 3x + 12 = 2x + 24
- x = 12
- Son's present age = 12 years
Last verified on 25-09-2026
750 The sum of ages of A and B is 40 years. 5 years ago, A was twice as old as B. Find B’s present age.
Explanation
- Let A = present age of A, B = present age of B
- A + B = 40
- (A-5) = 2(B-5) => A = 2B - 5
- Substituting: 2B - 5 + B = 40 => 3B = 45 => B = 15
Last verified on 25-09-2026