The product of two numbers is 120, and one is 10. What is the other? A. 10 B. 12 C. 14 D. 15 Explanation: 120 ÷ 10 = 12.
The sum of two numbers is 50, and their difference is 10. What are the numbers? A. 20, 30 B. 25, 25 C. 15, 35 D. 10, 40 Explanation: Solve equations.
The average marks of a class are 60. If the top 5 students average 80, what is the average of the remaining? A. 50 B. 55 C. 58 D. 60 Explanation: Weighted average calculation.
The average age of a family of 5 is 20 years. After 5 years, what will the average age be? A. 20 B. 22 C. 25 D. 27 Explanation: Each increases by 5 ⇒ average increases by 5.
The average of 7 numbers is 49. If one number is replaced by 70, the average becomes 50. What was the original number? A. 40 B. 42 C. 43 D. 45 Explanation: Difference in total = 7 ⇒ original = 42.
The average salary of 20 workers is Rs. 5000. If one leaves and the average becomes Rs. 4800, what was his salary? A. Rs. 6000 B. Rs. 7000 C. Rs. 8000 D. Rs. 9000 Explanation: Difference = Rs. 4000.
The average weight of 8 persons increases by 2 kg when a new person joins. What is the weight of the new person? A. 70 kg B. 72 kg C. 74 kg D. 76 kg Explanation: Increase = 16 ⇒ new person = 76 kg.