Entrance Exams
Govt. Exams
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Topics in Quantitative Aptitude
Q.861
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.862
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.863
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.864
Medium
Sum doubles in 8 years (SI). Rate of interest?
Correct Answer:
B. 12.5%
EXPLANATION
R=100/8=12.5%.
Q.865
Easy
30% of a number is 90. Find the number.
Correct Answer:
B. 300
EXPLANATION
x=90×100/30=300.
Q.867
Medium
A finishes work in 10 days, B in 15 days. Together?
Correct Answer:
B. 6 days
EXPLANATION
1/10+1/15=5/30=1/6. Together=6 days.
Q.868
Easy
Numbers in ratio 3:5, sum=64. Larger number?
Correct Answer:
B. 40
EXPLANATION
Larger=(5/8)×64=40.
Q.870
Easy
Simple interest on Rs 5000 at 8% for 3 years?
Correct Answer:
B. Rs 1200
EXPLANATION
SI=(P×R×T)/100=(5000×8×3)/100=Rs 1200.