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60 =s1+s2/2x6
s1+s2 = 60/3
s1+s2 = 20
s1 +s2 = 8 dan 12
maaf kalo salah
60= (3y+2y) x 6x 0.5
60= 5y x 3
60/3= 5y
20=5y
y=20/5=4
3y=3x4=12
2y=2x4= 8