SOLUTION: A student scored 72 and 89 on her first two quizzes. Write and solve a compound inequality to find the possible values for the third quiz score that would give her an average betw
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Question 996810: A student scored 72 and 89 on her first two quizzes. Write and solve a compound inequality to find the possible values for the third quiz score that would give her an average between 75 and 90, inclusive. Answer by fractalier(6550) (Show Source):
You can put this solution on YOUR website! The setup for this problem is
75 < (72+89+x)/3 < 90
Now multiply everything by three and simplify and get
225 < 161 + x < 270
Now subtract 161 and get
64 < x < 109
