Showing 41–50 of 654 questions
A boat covers 15 km upstream and 25 km downstream in 5 hours. What is the speed of the boat in still water if the river current is 2 km/h?
A
6 km/h
B
8 km/h
C
10 km/h
D
12 km/h
Correct Answer:
B. 8 km/h
Explanation:
Let boat speed = b. Upstream speed = b-2, Downstream speed = b+2. 15/(b-2) + 25/(b+2) = 5. Solving gives b = 8 km/h
What percentage of 250 is 75?
If the ratio of A:B:C is 2:3:5 and their sum is 100, what is the value of C?
Explanation:
Let A=2x, B=3x, C=5x. Sum = 10x = 100, so x=10. Therefore C = 5×10 = 50
Two numbers are in the ratio 3:4. If their sum is 140, what is the larger number?
Explanation:
Let numbers be 3x and 4x. Sum = 7x = 140, so x = 20. Larger number = 4×20 = 80
What is the equation of a line passing through (2,3) with slope 4?
A
y = 4x - 5
B
y = 4x + 3
C
y = 4x - 3
D
y = 2x + 4
Correct Answer:
A. y = 4x - 5
Explanation:
Using y - y₁ = m(x - x₁): y - 3 = 4(x - 2) → y = 4x - 5
A man spends 40% of his salary on food, 30% on rent, and saves the rest. If his salary is Rs. 50,000, how much does he save?
A
Rs. 10,000
B
Rs. 12,000
C
Rs. 15,000
D
Rs. 18,000
Correct Answer:
C. Rs. 15,000
Explanation:
Savings = 100% - 40% - 30% = 30%. 30% of 50,000 = 15,000
If a person invests Rs. 5000 at 8% simple interest per annum for 3 years, what is the total amount?
A
Rs. 6200
B
Rs. 6400
C
Rs. 6800
D
Rs. 7200
Correct Answer:
A. Rs. 6200
Explanation:
SI = (P × R × T)/100 = (5000 × 8 × 3)/100 = 1200. Total = 5000 + 1200 = 6200
A number when divided by 7 leaves remainder 3. What is the number if the quotient is 8?
Explanation:
Number = Divisor × Quotient + Remainder = 7 × 8 + 3 = 56 + 3 = 59
If 3 men can complete a task in 8 days, how many men are needed to complete it in 6 days?
Explanation:
Total work = 3 × 8 = 24 man-days. Men needed = 24/6 = 4
What is the probability of getting a sum of 7 when two dice are rolled?
A
1/6
B
1/8
C
1/12
D
1/18
Explanation:
Favorable outcomes: (1,6), (2,5), (3,4), (4,3), (5,2), (6,1) = 6. Total outcomes = 36. Probability = 6/36 = 1/6