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20. C. 5,1
diket: 3 logam r= 10cm
tabung r= 28cm
ditanya : tinggi air yang naik????
jawab :
Vtabung : V 3 logam
πr²t : 3 4/3πr^3
πr²t : 4πr^3 (sama-sama ada r dicoret/dihilangkan)
r²t : 4r^3
28×28×t : 4×10×10×10
784×t : 4000
t = 4000
784
=5,1cm
jadi, air yang naik setinggi 5,1cm