Question 60

In an examination, in a group of 5 boys and 7 girls, the average marks of the boys is 12 and the average marks of the girls is 18. The average marks of the group is

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The total marks of the boys are $$5 \times 12 = 60$$ and of the girls $$7 \times 18 = 126$$. The group of 12 students has total marks $$186$$. The average is $$\frac{186}{12} = 15.5$$.

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