Problema Solution
mary has a 87 average in mr. math's history class. her first four test scores were 84, 91, 74, and 88. What was her test score on the fifth test.
Answer provided by our tutors
let 'x' be the test score on the fifth test
87 = (84 + 91 + 74 + 88 + x)/5
by solving we find
x = 98
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Mary's score on the fifth test was 98 points.