If the average weight of a group of 15 items is 30 kg and none of the itemsweighs more than 32 kg, find the leastpossible weight (in kg) of any item in the group.

The average weight of 90 girls in a class is 20. The average weight of a group of 16 girls in the class is 12 kg and the average weight of another 34 girls in the class is 16. What is the average weight of the remaining girls in the class ?

The mean weight of a group of 9 students is 19 kg. If a boy of weight 29 kg is joined in the group, then find the mean weight of 10 students.

The average weight of a group of 22 students increases by 1 kg when the weight of the teacher is also included. If the initial average weight of the group of 22 students was 31 kg, then what is the weight of the teacher?

The average weight of 55 students is 55 kg , and the average weight of another 45 students is 45 kg . Find the average weight of all the students .

The average weight of 11 persons out of 12 is 95 kg. The weight of 12th person is 33 kg more than the average weight of all 12 persons. Find the weight of 12th persons