43 + 20 = 63, 63/7 = 9
352 + 103 = 455, 455/7 = 65
75 + 23 = 98, 98/7 = 14
115 + 67 = 182, 182/7 = 26
53 + 24 = 77, 77/7 = 11
$$\ \frac{\ 79+X}{7}=54$$
X = 299
The answer is option A.
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