1.What is the mean value of the following numbers: 312, 162, 132, 142, and 122?
2.A group of 10 individuals had their average age reduced by 3 years after one person aged 42 was replaced by another. What is the age of the new individual?
3.The average score of 12 students in a class is 36. If every student's score is multiplied by 2, what will be the new average score?
4.If the average of 10 numbers is 23, what will be the new average when each number is raised by 4?
5.If the average of 35 values is 25, what will be the new average when each value is multiplied by 5?
6.A person's average monthly income for January through April is Rs. 8000, while the average for February through May is Rs. 8500. If the salary earned in May is Rs. 6500, what was the salary for January?
7.A group of 30 students has an average score of 40, while another group of 50 students has an average score of 60. What is the combined average score of all the students together?
8.A batsman scored 64 runs in his 16th innings, which increased his overall average by 3 runs. What is his average after the 16th innings?
9.The mean of 13 numbers is 60. If the average of the first 7 numbers is 57 and the average of the last 7 numbers is 61, what is the value of the 8th number?
10.What is the mean value of the first 20 natural numbers?
11.The mean of 11 scores is 50. If the average of the first six scores is 49 and the average of the last six scores is 52, what is the value of the sixth score?
12.If the mean of five scores is 46 and the average of the first four scores is 45, what is the value of the fifth score?
13.Three years ago, the average age of a family consisting of six members was 19 years. Since then, a boy was born, and the current average age of the family remains unchanged. How old is the boy now?
14.The overall average salary of all employees in an office, including officers and clerks, is Rs. 90. Officers earn an average of Rs. 600 each, while clerks earn Rs. 84 on average. Given that there are 2 officers, what is the total number of employees in the office?
15.The average weight of 25 individuals in a boat was a certain value. When a new person weighing 46 kg joined them, the overall average weight dropped by 5 kg. What was the original average weight of the 25 individuals?
16.In a school, the average score in mathematics for all students who appeared in the public exam was 39. If four students who actually scored 5, 12, 15, and 19 marks respectively had not taken the exam, the new average would have been 44. How many students appeared for the examination from the school?
17.Nine men dined at a hotel. Eight of them each paid Rs. 3 for their meals, while the ninth person paid Rs. 2 more than the average amount spent by all nine. What is the total amount of money they all spent together?
18.The average age of 9 committee members remains unchanged from 2 years ago after replacing one older member with a younger one. By how many years is the new member younger than the one who left?
19.The average temperature for Monday through Thursday was 48 degrees, while the average for Tuesday through Friday was 46 degrees. Given that Monday's temperature was 42 degrees, what was the temperature on Friday?
20.A man bought 3 blankets at Rs.100 each, 5 blankets at Rs.150 each, and 2 blankets at an unknown price. He recalls that the average cost per blanket was Rs.150. What is the price of each of the two blankets if the average price is correct?