Posted by Carolyn on Saturday, April 27, 2013 at 9:36pm.
jim has grades of 84, 65, 76 on three tests. what grade must he obtain on the next test to have an average of exactly 80% for all four tests?

math  Ms. Sue, Saturday, April 27, 2013 at 9:57pm
84 + 65 + 76 = 225
0.8 * 400 = 320
320  225 = 95

math  Bosnian, Sunday, April 28, 2013 at 1:01am
( 84 + 65 + 76 + x ) / 4 = 80
84 + 65 + 76 + x = 4 * 80
225 + x = 320
x = 320  225 = 95

math  David Kroell, Monday, April 29, 2013 at 1:02pm
(65 + 84 + 76 + x ) / 4 = 80
(Balance the Equation)
225 + x = 320 [65 + 84 + 76 + x = 320]
(Balance the Equation)
x = 320  225 = 95

algebra  johanne laroche, Sunday, May 19, 2013 at 3:40pm
y=5x3 y=3x+13

math  Anonymous, Monday, January 6, 2014 at 2:04am
The sum of two consecutive numbers is 37. What are they
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