Answer:
Vinh must get 87 in the next test to maintain grade B.
Step-by-step explanation:
Vinh needs 420 points to have a B average in math.
His scores so far are 88, 89, 79, and 77.
Addition of these scores is = [tex]88+89+79+77=333[/tex]
Therefore, the minimum score he can make on the next test to maintain the grade B is :
[tex]420-333=87[/tex]
Hence, Vinh must get 87 in the next test to maintain grade B.
