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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Total age of the 7 pupils = 7 x 12 = 84
Total age of the 25 pupils = 25 x 14 = 350
Total age of the 6 pupils = 6 x 11 = 66
7 pupils leaving a class of 25 pupils given 18 pupils
Total age of the 18 pupils = 350 - 84 = 266
6 pupils joining 18 pupils = 24
Total age of 24 pupils = 266 + 66 = 322
Average age of 24 pupils now in class \(\frac{332}{24}\)
= 13yrs. 10 months