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48 - = 40
= 8
Biologi saja :
19 -
= 19 - 8
= 11 anak
40 = 17 + 19 - n(MnB) + 12
40 = 48 - n(MnB)
n(MnB) = 8 anak
yg gemar biologi = 19 - 8 = 11 anak