number = 9.x5
from [1]:
9.x5 => 15 - 5.35 => 9.65 => x = 6
9.x5 => 15 - 5.35 => 9.65 => x = 6
9.x5 => 15 - 5.36 => 9.64 => x = 6
9.x5 => 15 - 5.37 => 9.63 => x = 6
9.x5 => 15 - 5.38 => 9.62 => x = 6
9.x5 => 15 - 5.39 => 9.61 => x = 6
9.x5 => 15 - 5.40 => 9.60 => x = 6
9.x5 => 15 - 5.41 => 9.59 => x = 5
9.x5 => 15 - 5.42 => 9.58 => x = 5
9.x5 => 15 - 5.43 => 9.57 => x = 5
9.x5 => 15 - 5.44 => 9.56 => x = 5
so x can be 6 or 5 : not sufficient
from [2]
9.x5 => 5 + 4.65 => 9.65 => x = 6
9.x5 => 5 + 4.66 => 9.66 => x = 6
9.x5 => 5 + 4.67 => 9.67 => x = 6
9.x5 => 5 + 4.68 => 9.68 => x = 6
9.x5 => 5 + 4.69 => 9.69 => x = 6
9.x5 => 5 + 4.70 => 9.70 => x = 7
9.x5 => 5 + 4.71 => 9.71 => x = 7
9.x5 => 5 + 4.72 => 9.72 => x = 7
9.x5 => 5 + 4.73 => 9.73 => x = 7
9.x5 => 5 + 4.74 => 9.74 => x = 7
so x can be 6 or 7 : not sufficient
from [1] & [2] x = 6 ==> C
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