a student scores 74 out of 100 on a test. if the maximum on the next test is also 100, what does the student to maintain an average of 78
x = score of second test
average = ( 74 + x ) / 2
78 = ( 74 + x ) / 2 Multiply both sides by 2
156 = 74 + x Subtract 74 to both sides
156 - 74 = 74 + x - 74
82 = x
x = 82
average = ( 74 + x ) / 2 = ( 74 + 82 ) / 2 = 156 / 2 = 78