<PRE><B>Question 348219</B>
Let x = the score he must get on the third exam


(88 + 64 + x)/3 = x + 4


152 + x = 3(x + 4)


152 + x = 3x + 12


152 - 12 = 3x - x


140 = 2x


140/2 = x


70 = x


He must score 70 to raise his average by 4 points.


His average is x + 4 or 70 + 4 = 74.


The final answer is 70 on the third exam.


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