Question 68764
Let x = average scored on next 3 exams.
{{{(.6 + 3x) / 4 = .75}}}
{{{.6 + 3x = 3}}}
{{{3x = 2.4}}}
{{{x = .8}}}
So, if the student scores 80% or averages 80% on the last 3 tests, his
average for the 4 tests will be 75%