Two natural numbers whose sum is 72 cannot be in which ratio ____. A. 1: 2 B. 3: 5 C. 1 : 3 D. 3: 4 Explanation: 3:4 gives a total of 7 parts → 72 is not divisible by 7.
Two cylinders have equal heights. Their radii are in the ratio 1 : 3. What is the ratio of their volumes ____. A. 1 : 3 B. 1: 6 C. 1: 9 D. 3: 1 Explanation: Volume ∝ r², so ratio = 1² : 3² = 1 : 9.
If a number increases by 30% and then decreases by 20%, net effect is ____. A. 4% increase B. 4% decrease C. No change D. 6% increase Explanation: 1.3 × 0.8 = 1.04 → 4% increase.
If a number decreases by 50% and then increases by 100%, net effect is ____. A. No change B. 50% increase C. 50% decrease D. 100% increase Explanation: 0.5 × 2 = 1.
If income increases by 10% and expenditure increases by 20%, savings will ____. A. Increase B. Decrease C. Same D. Cannot determine Explanation: Expenditure grows faster.
If price decreases by 50% and consumption doubles, expenditure is ____. A. Same B. Increase C. Decrease D. Doubled Explanation: 0.5 × 2 = 1 → no change.
If a number increases by 20% and then by another 30%, total increase is ____. A. 50% B. 56% C. 60% D. 65% Explanation: 1.2 × 1.3 = 1.56 → 56%.
If cost price increases by 50% and selling price remains same, profit percent will ____. A. Increase B. Decrease C. Same D. Double Explanation: Higher CP reduces profit percentage.
If price increases by 60% and consumption decreases by 25%, what happens to expenditure? A. Increase B. Decrease C. Same D. Doubled Explanation: 1.6 × 0.75 = 1.2 → 20% increase.
If a number is decreased by 30% and then increased by 30%, net effect is ____. A. No change B. 9% decrease C. 9% increase D. 6% decrease Explanation: 0.7 × 1.3 = 0.91 → 9% decrease.