Solution:
Let there be boys and girls in the school.
Let and be the average scores of boys and girls respectively and be the average of both boys and girls. Then,
Hence,
The average score of boys in an examination of a school is 71 and that of girls is 73. The average score of school in that examination is 71.8. The ratio of the number of boys to the number of girls appeared in the examination, is
Let there be boys and girls in the school.
Let and be the average scores of boys and girls respectively and be the average of both boys and girls. Then,
Hence,