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Volume awal minyak = x 21 x 21 x 60 = 83160 = 83,16 liter
volume minyak yg tersisa = 83,16-27,72 = 55,89 liter = 55890
tinggi minyak sekarang = (55890) : ( x 21 x 21) = 40,325 cm
Jadi jawaban yang mendekati adalah 40 cm
= 22/7 × 21² × 60
= 83.160 cm³
= 83,16 liter
83,16 - 27,72 = 55,44 liter = 55.440 cm³
55.440 = 22/7 × 21² × t
55.440 = 1.386t
t = 40 cm (C)