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mungkin maksudna hasil bagi kedua bilangan 4
a/b = 4
a = 4b
a - b = 35
4b - b = 35
3b = 35
b = 35/3
a = 4(35/3) = 140/3
X = (140/3 + 35/3)/2
= 175/2
= 87,5