If a train travels 120 km in 2 hours, its speed is ____. A. 50 km/h B. 60 km/h C. 70 km/h D. 80 km/h Explanation: Speed = 120/2 = 60 km/h.
If 30% of a number is 150, the number is ____. A. 300 B. 400 C. 500 D. 600 Explanation: 0.3x = 150 → x = 500.
If a number is decreased by 25% and becomes 150, the original number is ____. A. 200 B. 180 C. 220 D. 240 Explanation: x × 0.75 = 150 → x = 200.
If a number is increased by 15% and becomes 230, the original number is ____. A. 180 B. 200 C. 210 D. 220 Explanation: x × 1.15 = 230 → x = 200.
If the compound interest for 2 years is Rs. 210 and the simple interest is Rs. 200, find the principal? A. Rs. 1000 B. Rs. 2000 C. Rs. 1500 D. Rs. 2500 Explanation: Difference used to find the rate, then principal = 1000.
If the difference between compound and simple interest for 2 years is Rs. 50 on Rs. 1000, find the rate? A. 5% B. 10% C. 7% D. 8% Explanation: Difference = P(R/100)² → R = 5%.
If the sum of two numbers is 50 and their product is 600, what are the numbers? A. 20 and 30 B. 25 and 25 C. 10 and 40 D. 15 and 35 Explanation: x² − 50x + 600 = 0 → roots = 20, 30.
If the average of 10 numbers is 40, what is the total sum? A. 400 B. 450 C. 350 D. 420 Explanation: Sum = average × count = 400.
If the ratio of ages of A and B is 3:5, after 10 years it becomes 5:7. Present age of A is ____. A. 15 B. 18 C. 20 D. 25 Explanation: Solving Equation gives A = 15.
If the average of 5 numbers is 20, their sum is ____. A. 80 B. 90 C. 100 D. 120 Explanation: Sum = average × count.