1.A contractor hires 20 male workers, 15 female workers, and 5 child workers. The daily wages are Rs.25 for each male worker, Rs.20 for each female worker, and Rs.8 for each child worker. What is the average daily wage paid by the contractor?
2.The entrance fee for visitors was Rs.15 on day one, Rs.7.50 on day two, and Rs.2.50 on day three. The number of attendees over the three days were in the ratio 2:5:13 respectively. What was the average amount paid per visitor throughout the event?
3.A hostel initially housed 100 students. When it accommodated 20 additional students, the average cost per student decreased by Rs. 5, yet the total expenditure rose by Rs. 400. What is the current total expenditure of the hostel?
4.A batsman scores 85 runs in his 17th innings, which raises his batting average by 3 runs. What is his new average after this innings?
5.Five years ago, the average age of a husband and wife was 23 years. Currently, the average age of the husband, wife, and their child is 20 years. Considering the child was born during this period, what is the child's current age?
6.If the average age of M boys is b years and the average age of n girls is c years, what is the combined average age of all the boys and girls together?
7.A shooting team of eight members participated in a contest. The highest scorer achieved 85 points. If this top scorer had earned 92 points instead, the team's average would have been 84. What is the total number of points scored by the entire team?
8.In an industry, the overall average salary of all employees is Rs. 200. The average salary for technicians is Rs. 400, while for non-technicians it is Rs. 125. What is the total number of employees in the industry?
9.The average age of a group of 8 men increases by 2 years when two men aged 20 and 24 are replaced by two women. What is the average age of these women?
10.What is the mean value of the first five prime numbers that are greater than 20?
11.The mean of 9 data points is 9. The average of the first 5 observations is 10, and the average of the last 5 observations is 8. What is the value of the 5th observation?
12.The average of the first three numbers out of four is 16, and the average of the last three numbers is 15. If the sum of the first and the fourth number is 13, what is the value of the fourth number?
13.The mean age of three boys is 15 years, and their ages are in the ratio 3:5:7. What is the age of the youngest boy?
14.What is the mean value of the first ten odd numbers?
15.What is the mean value of the first ten natural numbers?
16.What is the mean value of the first ten odd prime numbers?
17.The mean of 11 numbers is 10.9. If the mean of the first six numbers is 10.5 and the mean of the last six numbers is 11.4, what is the value of the sixth number?
18.What is the mean value of the first ten even integers?
19.A man expended Rs. 3300, which represents 75% of his monthly earnings. What is his total monthly income?
20.How are prime numbers defined?