A group of 4 boys and 5 girls take a test. What is the average (arithmetic mean) score of the group in the test?

A group of 4 boys and 5 girls take a test. What is the average (arithmetic mean) score of the group in the test?
1. The average score of the boys is 23 points while the average score of the girls is 20 points
2. If one of the girls had scored 6 points more, the average score of the group would have been 22

OA D

Source: e-GMAT

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