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John received a 68%, 72%, and 85% on three of his math tests. After his fourth math test he now has a 79% average. What score did he have received on his fourth test?

A) 79%
B) 89%
C) 91%
D) 100%


PLEASE EXPLAIN WHY OR I WILL RATE TWO STARS!

Respuesta :

biffyboffboof

Answer:

68+72+85=225

plus 79 =304 divided by 4 = 76

plus 89 =314 divided by 4 = 78.5

plus 91=316 divided by 4 = 79

so the answer is C

plz brainlest

jamietakash1

Answer:

91%

Step-by-step explanation:

(0.68 + 0.72 + 0.85 + x)/4 = 0.79

(2.25 + x)/4 = 0.79

0.5625 + 1/4x = 0.79

1/4x = 0.2275

x = 0.91 = 91%

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