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V drum =
V drum = 665280
V kaleng =
V kaleng =
V kaleng = 4620
Banyak kaleng yang dibutuhkan =
= 144 kaleng
luas tabung=22/7×42×42×120=776160
tabung ke-2=r=d÷2=14÷2=7
=22/7×7×7×30=4620
776160÷4620=168 kaleng