a. fifth test = 85; sixth test = 89
b. fifth test = 85; sixth test = 81
c. fifth test = 89; sixth test = 85
d. fifth test = 90; sixth test = 86
let the score of the fifth test be x, then that of the last test is x-4,
so we have (2x-4+93+87+82+86)/6 = 87
solve for x
x = 89, the last test she got 85
c is correct
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