Central Exam — Quantitative Aptitude
UPSC · SSC · Bank · Railway · NDA — Central Government Exam MCQ Practice
Showing 241–250 of 1,106 questions
Q.242
Easy
30% of a number is 90. Find the number.
Correct Answer:
B. 300
Explanation:
x=90×100/30=300.
Q.243
Medium
Sum doubles in 8 years (SI). Rate of interest?
Correct Answer:
B. 12.5%
Explanation:
R=100/8=12.5%.
Q.244
Medium
Average of 5 numbers is 28. Excluding one, avg becomes 25. Excluded number?
Correct Answer:
A. 40
Explanation:
Sum=140. New sum=100. Excluded=40.
Q.245
Medium
Compound interest on Rs 10000 at 10% for 2 years?
Correct Answer:
B. Rs 2100
Explanation:
CI=10000×1.1²-10000=12100-10000=Rs 2100.
Q.246
Medium
Pipe fills tank in 6 hrs, another empties in 12 hrs. Together?
Correct Answer:
B. 12 hours
Explanation:
Net=1/6-1/12=1/12. Time=12 hrs.
Q.249
Medium
Selling price Rs 840, profit 20%. Cost price?
Correct Answer:
B. Rs 700
Explanation:
CP=840×100/120=Rs 700.
Q.250
Easy
Sum of first 20 natural numbers?
Correct Answer:
B. 210
Explanation:
n(n+1)/2=20×21/2=210.