The time taken upstream is twice that downstream. Find the speed relation. A. 12 km/h B. 13 km/h C. 14 km/h D. 15 km/h Explanation: Solve using the speed ratio method.
The third proportional to 3.5 and 5.6 is ____. A. 8.96 B. 8 C. 4.5 D. 6.2 Explanation: Third proportional = (5.6²)/3.5.
The tens digit of a two-digit number is 2 more than the units digit. The number is 7 times the sum of its digits. Find the units digit. A. 1 B. 2 C. 3 D. 4 Explanation: Let the unit digit = x, solve Equation.
The temperature at noon was 6°C on Monday and 4°C on Tuesday. Find the average temperature change. A. 14°C B. −2°C C. 2°C D. 7°C Explanation: Change = 6 − 4 = 2°C.
A tax is reduced by 20% and consumption increases by 10%. What is the net effect? A. 20% B. 18% C. 15% D. 12% Explanation: Net effect = 0.8 × 1.10 = 0.88 → 12% decrease.
A tax is reduced by 20% and consumption increases by 15%. What is the effect on revenue? A. Increases by 8% B. Decreases by 8% C. No change D. Increases by 10% Explanation: Net effect = 0.8 × 1.15 = 0.92 → 8% decrease.
A petrol tank lasts 10 days. If consumption patterns change, how long will it last? A. 5 days B. 6 days C. 7 days D. 8 days Explanation: Adjusting the consumption rate leads to a duration of 8 days.
Surface area of the cube is 24 cm². Find volume. A. 8 cm³ B. 16 cm³ C. 32 cm³ D. 64 cm³ Explanation: Side = 2 → volume = 8.
Surface area of the cube is 726 m². Find volume. A. 1300 m³ B. 1331 m³ C. 1452 m³ D. 1542 m³ Explanation: Side = √(726/6).
Surface area of brick 10×4×3 cm is ____. A. 84 cm² B. 124 cm² C. 164 cm² D. 180 cm² Explanation: TSA = 2(lb+bh+hl).