Wednesday

October 22, 2014

October 22, 2014

Posted by **Simon** on Tuesday, May 11, 2010 at 5:43pm.

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

- math -
**PsyDAG**, Wednesday, May 12, 2010 at 7:48pmMean = (sum of scores)/number of scores

If I understand your problem correctly, the ratio of the three scores are 6:5:3 and the mean of the three = 75. If that is what you are saying, then:

75 = (6x + 5x + 3x)/3 = 14x/3

14x = 225

Solve for x.

However, this does not give you the answers you indicate. Sorry. Can you state the problem more clearly?

**Answer this Question**

**Related Questions**

math - In a test, the average was 74 points/100 points. After the test, three of...

statistic - The average score on a standardized test is 750 points with a ...

statistics - The average score on a standardized test is 500 points with a ...

Statistics - A student wants to test her hypothesis she gives each of her ...

Algebra - The 22 students present for a recent test in Ms. Huang’s class had an ...

math - Mr. Noonan told Vic that his test had 38 problems worth a total of 100 ...

Math - a group of 100 students took a quiz. Their average score was 76 points. ...

statistics - On one 100-point test, Lisa managed to get 74 points. On a ...

math - The average score on a reading test for 58 students was 87.3. Twelve more...

math - In his NPR radio program "A Prairie Home Companion," Garrison Keillor ...