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2b= 30c
...b=90c
90c=6b
6b=4a
4 apel
a:apel
b:jambu
c:anggur
90 anggur = ((90:30)×2 = 6)
90 anggur = 6 jambu
3 jambu = 2 apel
6 jambu = ((6:3)×2 = 4)
jadi jawabannya = 4 apel