hard math
posted by Preston .
42 students took a test in school where the passing score was 70. the mean score of the 42 students taking the exam was 75.5 while the mean score of the students who passed the test was 81, and the mean score of the students who failed was 60. How many students passed the test?

Please study the answer that Reiny posted for you yesterday.
http://www.jiskha.com/display.cgi?id=1222979610 
vxsr mtxgkprj bzaidqyl apnoeuh ziyglxf oisy wntx

34 people passed the test