Question

Pedro has scores of 95, 84, 68, 92 after four tests. what score must he make on his fifth test to have an average of 78 or greater?

Answer 1

51 or above

Explanation:

He already averages more then 78. But he at least needs a 51 in order for him to average 78. For him to get more than that he just needs a 52 or higher.

78 x 5 = 390

95 + 92 + 84 + 68 = 339

339/ 4 = 84.75 ( just to let you know the average before #5 )

390 - 339 = 51

51 is that last score needed