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timo = bona - 5
timo = 15 buah
bona - 5 = timo
bona - 5 = 15
bona = 15 + 5
bona = 20 buah
ali = bona + 12
ali = 20 + 12
ali = 32 buah
jadi jumlah pensil ali dan timo = 32 + 15 = 47 buah
Jadi,jumlah pensil Ali dan Timo adalah = 27 buah