A man can complete a work in 12 days. He works for 4 days. Remaining work is ____. A. 1/2 B. 1/3 C. 2/3 D. 3/4 Explanation: Work done = 4/12 = 1/3 → remaining = 2/3.
A person invests Rs. 5000 at 10% and Rs. 3000 at 12%. Total interest is ____. A. Rs. 860 B. Rs. 900 C. Rs. 800 D. Rs. 840 Explanation: Interest = 500 + 360 = 860.
A person covers a distance at 40 km/h and returns at 60 km/h. Average speed is ____. A. 48 km/h B. 50 km/h C. 45 km/h D. 52 km/h Explanation: Average = 2ab/(a+b) = 48 km/h.
A train 200 m long passes a platform 300 m long in 25 seconds. Speed is ____. A. 10 m/s B. 20 m/s C. 25 m/s D. 30 m/s Explanation: Total distance = 500 m → speed = 20 m/s.
A train 100 m long passes a pole in 5 seconds. Speed is ____. A. 20 m/s B. 25 m/s C. 30 m/s D. 40 m/s Explanation: Speed = distance/time = 100/5 = 20 m/s.
A man buys an article for Rs. 500 and sells it at a loss of 10%. Selling price is ____. A. Rs. 450 B. Rs. 400 C. Rs. 480 D. Rs. 420 Explanation: SP = 90% of 500 = 450.
A number when decreased by 20% becomes 80. The number is ____. A. 90 B. 100 C. 120 D. 110 Explanation: x × 0.8 = 80 → x = 100.
A number when increased by 25% becomes 125. The number is ____. A. 75 B. 80 C. 90 D. 100 Explanation: Let x × 1.25 = 125 → x = 100.
A sum of money doubles itself in 5 years at simple interest. What is the rate of interest? A. 10% B. 20% C. 25% D. 40% Explanation: Doubling ⇒ SI = principal → rate = 100/5 = 20%.
A sum becomes Rs. 1210 in 2 years at 10% per annum compound interest. What is the principal? A. Rs. 1000 B. Rs. 1100 C. Rs. 1200 D. Rs. 900 Explanation: 1000 × (1.1)² = 1210.