Southwest normal university printing plate sixth grade second volume olympiad math problem.

6 1 class in a math exam, the average score of the whole class is 78, and the average scores of boys and girls are 75.5 and 8 1 respectively. The ratio of boys to girls in this class is ()

The answer is 6: 5.

Process: Number of boys *(78-75.5)= Number of girls *(8 1-87)

Number of boys: Number of girls = 6: 5

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