The sum of five consecutive even numbers is 440. Find another set where the second least is 121 less. A. 248 B. 240 C. 228 D. 236 Explanation: Adjust numbers accordingly.
Sum and product of roots of Equation x² + 20x + 3 = 0 are ____. A. 10, 3 B. -10, 3 C. -20, 3 D. -10, -3 Explanation: Sum = −b/a, product = c/a.
Successive discounts of 20% and 15% are equal to a single discount of ____. A. 35% B. 38% C. 32% D. 29% Explanation: Combined discount = 1 − (0.8×0.85).
A sphere is melted into 3 spheres. Diameters are given. Find the third diameter. A. 2.66 cm B. 2.5 cm C. 3 cm D. 3.5 cm Explanation: Volume conservation applied.
Ratio of speed of boat to stream is 36:5. Time downstream is 5h 10min. Find upstream time. A. 5h 50m B. 6h C. 6h 50m D. 12h 10m Explanation: Use the ratio method for speeds.
Speed upstream is 60 km/h and downstream is 80 km/h. Find stream speed. A. 10 km/h B. 27 km/h C. 60 km/h D. 55 km/h Explanation: Stream speed = (down − up)/2.
The speed of the boat in still water is 60 km/h, and the current is 20 km/h. Find downstream and upstream speeds. A. 35, 25 B. 80, 40 C. 40, 60 D. 50, 55 Explanation: Downstream = 80, upstream = 40.
The speed of the boat in still water is 5 km/h. It travels upstream and downstream the same distance. Find stream speed. A. 5 km/h B. 8 km/h C. 10 km/h D. 15 km/h Explanation: Equal time implies that stream speed equals still-water speed.
The speed of the boat in still water is 2 km/h, and the upstream speed is 1 km/h. Find stream speed. A. 1.5 km/h B. 3 km/h C. 1 km/h D. None Explanation: Stream speed = difference.
The speed of a man rowing in still water is 15 km/h. If he rows downstream and upstream, find the time relation. A. 10 sec B. 15 sec C. 20 sec D. 12 sec Explanation: Based on the speed relation between the stream and still water.