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20 : 27
V = π r^2h
r1 : r2 = 2 : 3
h1 : h2 = 5 : 3
V1 : V2 = ?
π r1^2h1 : π r2^2h2
= r1^2h1 : r2^2h2
= (r1/r2)^2 : (h2/h1)
= (2/3)^2 : (3/5)
= 4/9 : 3/5
V1 : V2 = 20 : 27
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