self Maths Puzzle

Average age of 9 members of a club is 29 years. If 2 more persons with the average age of 40 years have become the members of the club, find average age of all the 11 members.

Read Solution (Total 2)

31 yrs
Average of 11 members = (9*29+2*40)/11 = 341/11= 31 yrs
10 years agoHelpfull: Yes(1) No(0)

total of 11 members=29*9+2*40=341
new avg of 11 members=341/11=31 Ans.
10 years agoHelpfull: Yes(0) No(0)

self Other Question

The average weight of the students in four sections A, B, C and D is 55 kg. The average weights of the students A, B, C and D are 45 kg, 40 kg, 75 kg and 85kg respectively. If the average weight of the students of section A and D together is 65 kg and that of B and D together 55 kg, then what is the ratio of the number of students in A and C? . The average marks obtained by some students in an examination is 54. If 20% of the students got a mean score of 90 marks and the 30% of the students got a mean score of 20. Find the average marks of the remaining students.