help on a word problem

Algebra
Tutor: None Selected Time limit: 1 Day

wade has a test score of 77% on his first test and 65% on his second test. What must he score on a third test to have a average of 80% overall ?

May 13th, 2015

(77 + 65 + X)/3 = 80

(142 + X) = 80 x 3

X = 240 - 142

X = 98

He has to score 98%

May 13th, 2015

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