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Verified answer
D = 24 cmr = 12 cm
t = 25 cm
πr²t = 2 x 4/3 x πr³
π x 12²t = 8/3 x π x 6 x 6²
144πt = 576π
t = 576π/144π
t = 4 cm
tinggi air sekarang = 25+4 = 29 cm