Homework Help: math

Posted by charlie on Saturday, November 24, 2012 at 9:39am.

the average mark of 10 tests is 76%.If the average mark of the first 7 tests was 73%,what is the average mark of the remaining 3 test

math - drwls, Saturday, November 24, 2012 at 9:46am
76*10 = 7*73 + 3x
3x = 249
x = 83

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