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Mathematics
8 pupils of average age of 12yrs leave a class of 30pupils of average age 14yrs. If 6 new pupils of average age 11yrs join the class. What is the average age of the pupils now in the class
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(30*14 - 8*12 + 6*11 ) / (30-8+6) = 390/28 = 13.9
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