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total = 25
gemar minum susu = 17
gemar minum teh dan susu = 8
tidak gemar susu maupun teh = 3
yang gemar minum teh = x
Ditanyakan :
x?
Jawab :
25 = 17 - 8 + 3+ x - 8 + 8
25 = 9 + 3 + x - 8 + 8
25 = 12 +x -8 + 8
25 = 4 +8 + x
25 = 12 +x
25 - 12 = x
13 = x
yang gemar susu = 13 - 8
= 5