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In Chemistry class, Andrew has earned scores of 64, 69, and 73 on three tests. He must maintain an average of 70 to pass the course. What score must Andrew earn on the final exam to pass the course?

Answer :

lillseria
64 + 69 + 73 + x   =  70
            4

206 + x= 70
  4
 x        = (70 * 4) - 206
           = 280 - 206
           = 74
check: 64 + 69 + 73 + 74 = 70
                    4

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