Govt Exam — Quantitative Aptitude
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Showing 101–110 of 499 questions
Q.101
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.102
Medium
Sum doubles in 8 years (SI). Rate of interest?
Correct Answer:
B. 12.5%
Explanation:
R=100/8=12.5%.
Q.103
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.104
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.105
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.106
Medium
Selling price Rs 840, profit 20%. Cost price?
Correct Answer:
B. Rs 700
Explanation:
CP=840×100/120=Rs 700.
Q.107
Medium
How many ways can 5 books be arranged on a shelf?
Correct Answer:
B. 120
Explanation:
5!=120.
Q.108
Medium
Numbers
If a number is divisible by both 9 and 11, it must be divisible by which of the following?
Correct Answer:
A. 99
Explanation:
Since 9 and 11 are coprime (HCF = 1), the number must be divisible by 9 × 11 = 99.
Q.109
Medium
Numbers
The average of five consecutive even numbers is 24. What is the largest number?
Correct Answer:
B. 28
Explanation:
Let numbers be x, x+2, x+4, x+6, x+8. Sum = 5x + 20 = 120, so x = 20. Largest = 20 + 8 = 28.
Q.110
Medium
Numbers
How many numbers between 1 and 100 are divisible by both 6 and 9?
Correct Answer:
A. 5
Explanation:
Numbers divisible by both 6 and 9 must be divisible by LCM(6,9) = 18. Between 1-100: 18, 36, 54, 72, 90. Count = 5.