Average

141 A person covers a certain distance by car at a speed of 25 km/h and comes back at a speed of 40 km/h. What is his average speed during his travel?

142 The average salary of the entire staff in an office is ₹ 500 per day. The average salary of officers is ₹ 750 and that of non-officers is ₹ 250. If the number of officers is 15, then find the number of non-officers in the office:

143 The average marks obtained by 120 students in an examination is 30. If the average marks of passed students is 40 and that of the failed students is 10, what is the 25% of the number of students who passed the examination?

144 3yr ago, the average age of a family of 5 members was 17 yr. Even after the birth of a child, the average is same today. Find out the age of child:

145 If a person covers three equal distances at the speed of 30 km/h, 15 km/h and 10 km/h respectively, then find out his average speed during the whole journey:

146 5 yr ago, the average age of Rashmi and Surbhi was 20 yr. Now, the average age of Rashmi, Surbhi and Meeta is 30 yr. What will be the age of Meeta after 15 yr?

147 The average weight of 10 women is increased by 1 kg if 2 women of 42 kg and 38 kg are replaced by 2 men. Find the average weight of both the men:

148 The average age of a class is 35 yr. 6 new students with an average age of 33 years joined in that class, there by decreasing the average by half year. The original strength of the class was..:

149 In the afternoon, a student read 100 pages at the rate of 60 pages/h. In the evening, when she was tired, she read 100 more pages at the rate of 40 pages/h. What was her average rate of reading, in pages per hour?

150 The average of four positive integers is 73.5. The highest integer is 108 and the lowest integer is 29. The difference between the remaining two integers is 15. Which of the following is the smaller of the remaining two integers?