A class has 20 boys and 30 girls. The average age of boys is 12 years and that of girls is 11 years what is the average age of the whole class?
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Boys total 20* 12 = 240
Girls total 30* 11 = 330
Total = 240 + 330 = 570
Avg age of whole class = 570 / 50 = 11.4 year
Girls total 30* 11 = 330
Total = 240 + 330 = 570
Avg age of whole class = 570 / 50 = 11.4 year
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