Central Exam — Quantitative Aptitude
UPSC · SSC · Bank · Railway · NDA — Central Government Exam MCQ Practice
Showing 91–100 of 429 questions
Q.91
Easy
30% of a number is 90. Find the number.
Correct Answer:
B. 300
Explanation:
x=90×100/30=300.
Q.94
Easy
Sum of first 20 natural numbers?
Correct Answer:
B. 210
Explanation:
n(n+1)/2=20×21/2=210.
Q.95
Easy
Area of rectangle: length 12m, breadth 8m?
Correct Answer:
B. 96 sq m
Explanation:
Area=12×8=96 sq m.
Q.97
Easy
A man earns Rs 15000/month and spends 60%. Savings?
Correct Answer:
B. Rs 6000
Explanation:
Savings=40% of 15000=Rs 6000.
Q.98
Easy
Numbers
What is the HCF of 48 and 64?
Correct Answer:
B. 16
Explanation:
Find HCF of 48 and 64 using Euclidean algorithm: 64 = 48 × 1 + 16; 48 = 16 × 3 + 0. Therefore, HCF = 16.
Q.99
Easy
Numbers
Find the LCM of 12 and 18.
Correct Answer:
B. 36
Explanation:
12 = 2² × 3; 18 = 2 × 3². LCM = 2² × 3² = 4 × 9 = 36.
Q.100
Easy
Numbers
Which of the following is a prime number?
Correct Answer:
C. 61
Explanation:
61 is only divisible by 1 and itself. 51 = 3 × 17, 57 = 3 × 19, 63 = 9 × 7 are composite numbers.