The sum of three consecutive numbers is 72. Find the middle number ____. A. 22 B. 24 C. 26 D. 28 Explanation: Let numbers x−1, x, x+1 → 3x = 72.
The average of 5 numbers is 20. If one number is excluded, the average becomes 18. What is excluded number ____. A. 25 B. 28 C. 30 D. 35 Explanation: Total = 100, new total = 72 → difference = 28.
A mixture of milk and water contains 20% water. How much water should be added to make it 25% ____. A. 5% B. 10% C. 15% D. Cannot be determined Explanation: Initial quantity not given.
A boat goes downstream at 12 km/h and upstream at 8 km/h. Speed of stream ____. A. 2 km/h B. 3 km/h C. 4 km/h D. 5 km/h Explanation: Stream speed = (12−8)/2.
A train running at 54 km/h crosses a bridge in 30 seconds. Length of bridge if train length is 150 m ____. A. 200 m B. 250 m C. 300 m D. 350 m Explanation: Convert speed and use the distance formula.
A train 120 m long crosses a pole in 6 seconds. Speed of train ____. A. 20 m/s B. 18 m/s C. 22 m/s D. 25 m/s Explanation: Speed = distance/time.
A man buys an article for Rs. 800 and sells it at a loss of 10%. Selling price ____. A. 720 B. 740 C. 760 D. 780 Explanation: SP = 800 × 0.9.
A shopkeeper marks goods 25% above the cost price and gives 10% discount. What is his profit percent ____. A. 10% B. 12.5% C. 15% D. 20% Explanation: Net gain = (1.25 × 0.9 − 1) × 100.
A number when increased by 20% becomes 72. What is the number ____. A. 50 B. 55 C. 60 D. 65 Explanation: 1.2x = 72 → x = 60.
A number exceeds its 2/5 by 10. What is the number ____. A. 20 B. 25 C. 30 D. 35 Explanation: x − 2x/5 = 10 → x = 25.