Homework Help: math

Posted by Simon on Tuesday, May 11, 2010 at 5:45pm.

In a test, the average was 74 points/100 points. After the test, three of students relocate. Then the average was 75 points/100. The circumstances of the students were 6:5:3. How many points did the three students have?

I know the answere is 45, 75 and 90, but can you write the operation?

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