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 di d he have received on his fourth test?
2 answers:
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
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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