help please help algerbra 3

Question

A student has test scores of 68%,75%,and 79%. What must she score on the last exam to 80% or better

Answer 1

98

if each has same weight

(68+75+79+x)/4 = 80

222 +x= 4(80)= 320

x = 320-222 = 98

unless teacher rounds up from 79.5 to 80, then

222 +x = 4(79.5) = 318

x = 318-222 = 96

so, 96 if teacher is reasonable

98 if s/he is a sadistic ogre