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4 buah/pak
menjual 15 baterai
membalil 8 pak baterai
jumlah?
jawab:
(18 × 4) - 15 + (8 × 4)
72 - 15 + 32
57 + 32
89
Jadi,jumlah baterai sekarang sebanyak 89 buah baterai
= 72 - 15 ( baterai yang laku )
= 57 + ( 8 × 4 )
= 57 + 32 ( baterai baru )
= 89
jadi , sisa baterai di toko 89 buah baterai