Showing 1–10 of 50 questions
in NoSQL Databases
If the cost price of an item is Rs. 400 and it is sold at a loss of 15%, what is the selling price?
A
Rs. 340
B
Rs. 350
C
Rs. 360
D
Rs. 380
Correct Answer:
A. Rs. 340
Explanation:
Loss = 15% of 400 = 60. Selling Price = 400 - 60 = Rs. 340
Two pipes A and B can fill a tank in 12 hours and 18 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
A
6.5 hours
B
7.2 hours
C
8.5 hours
D
9 hours
Correct Answer:
B. 7.2 hours
Explanation:
Rate of A = 1/12 per hour. Rate of B = 1/18 per hour. Combined rate = 1/12 + 1/18 = 3/36 + 2/36 = 5/36. Time = 36/5 = 7.2 hours
A person spends 30% of his income on food, 40% on rent, and 20% on utilities. If his remaining income is Rs. 5,000, what is his total income?
A
Rs. 45,000
B
Rs. 50,000
C
Rs. 55,000
D
Rs. 60,000
Correct Answer:
B. Rs. 50,000
Explanation:
Percentage spent = 30 + 40 + 20 = 90%. Remaining = 10% = 5,000. Total income = 5,000 × 10 = Rs. 50,000
A shopkeeper marks up goods by 50% and gives a discount of 20%. What is his profit percentage?
Explanation:
Let CP = 100. Marked Price = 150. After 20% discount: SP = 150 × 0.8 = 120. Profit = 20%
A bag contains 5 red balls, 7 blue balls, and 8 green balls. What is the probability of drawing a red ball?
A
1/4
B
1/5
C
7/20
D
5/20
Explanation:
Total balls = 5 + 7 + 8 = 20. Probability of red = 5/20 = 1/4
If a sequence is 2, 5, 10, 17, 26, what is the next number?
Explanation:
Differences: 3, 5, 7, 9... next difference is 11. So 26 + 11 = 37
A man's age is 3 times his son's age. After 10 years, his age will be 2 times his son's age. What is the son's current age?
A
8 years
B
10 years
C
12 years
D
15 years
Correct Answer:
B. 10 years
Explanation:
Let son's age = x. Man's age = 3x. After 10 years: 3x + 10 = 2(x + 10). 3x + 10 = 2x + 20. x = 10
If (a + b)² = 64 and ab = 15, what is a² + b²?
Explanation:
(a + b)² = a² + 2ab + b². 64 = a² + b² + 30. a² + b² = 34
Find the missing number in the series: 1, 1, 2, 3, 5, 8, ?, 21
Explanation:
This is the Fibonacci series where each number is the sum of the previous two. 5 + 8 = 13
In a class, 60% students passed in Math, 70% passed in Science, and 50% passed in both. What percentage of students failed in both subjects?
Explanation:
Passed in at least one = 60 + 70 - 50 = 80%. Failed in both = 100 - 80 = 20%
