Question 1004133
(80+92+86+78+x)/5 > 85
(336+x)/5 > 85
336+x > 425
x > 89 is the grade she needs to get an average of 85. If the requirement is that it must be greater than 85, then:
89+1= 90 is the lowest she needs to have an average greater than 85
Nice grades, study so yours are as good.
J