7 pupil of average age 12 leaves a class of 25 pupils of average age 14years if 6 new pupils of average age 11years join the class, what's is the average age of the pupils in the class
Good grief!
Why is it too much to expect students to post a question
using proper English, with correct grammar and punctuation ?
From this gibberish ....
Total ages of original class = 25*14 or 350
Ages of students that leave = 7*12 = 84
Ages of students that join = 6*11 = 66
total of ages at end = 350 - 84 + 66 = 332
total number of students at end = 25 - 7 + 6 = 24
new average age = 332/24 = appr 13.8