Maths MCQs for AD (ASF)
Q21. What is the value of √(144 × 25)?
- A) 50
- B) 55
- C) 60
- D) None of these
Answer: C
144 × 25 = 3600 and √3600 = 60.
Q22. If 15% of a number is 45, what is 30% of that number?
- A) 60
- B) 75
- C) 90
- D) None of these
Answer: C
15% = 45, therefore total number = 300. 30% of 300 = 90.
Q23. What is the value of (56 ÷ 8) × 3 + 4²?
- A) 37
- B) 35
- C) 41
- D) None of these
Answer: A
56 ÷ 8 = 7, 7 × 3 = 21 and 4² = 16. Total = 37.
Q24. The smallest 5-digit number exactly divisible by 12, 15 and 20 is
- A) 10020
- B) 10060
- C) 10080
- D) None of these
Answer: A
LCM of 12, 15 and 20 = 60. First 5-digit multiple is 10020.
Q25. Which smallest number must be added to 1234 to make it exactly divisible by 9?
- A) 1
- B) 2
- C) 3
- D) None of these
Answer: D
1+2+3+4 = 10. Next multiple of 9 is 18, so add 8.
Q26. A bag contains Rs 420 in the ratio 3 : 4 : 7 among three persons. What is the largest share?
- A) Rs 147
- B) Rs 196
- C) Rs 210
- D) None of these
Answer: C
Total ratio parts = 14. Largest share = (7/14) × 420 = 210.
Q27. If A : B = 2 : 3 and B : C = 4 : 5, then A : C = ?
- A) 8 : 15
- B) 6 : 10
- C) 2 : 5
- D) None of these
Answer: A
A:B = 8:12 and B:C = 12:15. Therefore A:C = 8:15.
Q28. The ratio of ages of father and son is 7 : 2. Father is 35 years old. The son’s age after 5 years will be
- A) 10 years
- B) 15 years
- C) 12 years
- D) None of these
Answer: B
Son’s present age = (2/7) × 35 = 10 years. After 5 years = 15 years.
Q29. A is 5 years older than B. Ten years ago, A was twice as old as B. What is B’s present age?
- A) 15
- B) 20
- C) 18
- D) None of these
Answer: A
Let B = x and A = x+5. Solving x−5 = 2(x−10) gives x = 15.
Q30. A shopkeeper marks goods 40% above cost price and gives 20% discount. His profit percentage is
- A) 12%
- B) 15%
- C) 20%
- D) None of these
Answer: A
CP = 100, MP = 140 and after 20% discount SP = 112. Profit = 12%.
