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In an examination, the average marks of 60 girls is 15 and the average marks of 40 boys is 30. The average marks of the group in which the boys and girls are taken together is : |
15 21 24 60 |
21 |
Sum of marks of 60 girls = 60 × 15 = 900 Sum of marks of 40 boys = 40 ×30 = 1200 Average marks of whole group = \(\frac{1200 + 900 }{100}\) = 21 |
