A student has scores of 73, 75, and 84 on his first three tests. He needs an average of at least 80 to earn a grade of B in the
class. What is the minimum score that the student needs on the fourth test to ensure a B? The student needs a minimum score of
on the fourth test to ensure a grade of at least a B.
Question HelpQuestion 28: Video1
80*4 = 320 320- (73 + 75 +84 ) = 88 we can cross out 320/80 = 32/8 and 232/320 = 232 /4 (320/4) and divide each side by 4 = 58 / 80 then 29/40 = 40-29 = 11 then decimalise /10 = 1.1 then multiply 80 * 1.1 = 88
