If a number is decreased by 10% and then by 20%, net decrease is ____. A. 28% B. 30% C. 32% D. 25% Explanation: 0.9 × 0.8 = 0.72 → 28% decrease.
If the difference of two numbers is 12 and their product is 180, the numbers are ____. A. 6 and 30 B. 10 and 18 C. 12 and 15 D. 9 and 20 Explanation: Solve x² − 12x − 180 = 0 → roots = 18 and 10.
If one number is 3 times another and their sum is 80, the numbers are ____. A. 20 and 60 B. 25 and 55 C. 30 and 50 D. 15 and 65 Explanation: Let x + 3x = 80 → x = 20.
If a number is 40% of another and their sum is 140, the numbers are ____. A. 40 and 100 B. 50 and 90 C. 60 and 80 D. 70 and 70 Explanation: Let larger = 100 → smaller = 40 → sum = 140.
If the ratio of two numbers is 5:7 and their sum is 144, the numbers are ____. A. 50 and 94 B. 60 and 84 C. 70 and 74 D. 65 and 79 Explanation: Total parts = 12 → each = 12 → numbers = 60 and 84.
If ratio of two numbers is 3:5 and difference is 20, numbers are ____. A. 30 and 50 B. 40 and 60 C. 20 and 40 D. 25 and 45 Explanation: Difference = 2 parts → 1 part = 10.
If ratio of two numbers is 7:9 and their sum is 160, numbers are ____. A. 60 and 100 B. 70 and 90 C. 65 and 95 D. 75 and 85 Explanation: Total parts = 16 → each = 10 → numbers 70, 90.
If a sum becomes Rs. 1210 in 2 years at CI 10%, principal is ____. A. Rs. 900 B. Rs. 1000 C. Rs. 1100 D. Rs. 1200 Explanation: Reverse calculation gives 1000.
If a sum earns Rs. 500 as simple interest in 5 years at 5%, principal is ____. A. Rs. 2000 B. Rs. 2500 C. Rs. 3000 D. Rs. 1500 Explanation: P = (SI×100)/(RT) = 2000.
If cost price is Rs. 1000 and selling price is Rs. 850, loss percent is ____. A. 10% B. 12% C. 15% D. 20% Explanation: Loss = 150 → 15%.