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7.
Tabung besar
V = πr²t
V = 22/7 x 70² x 100
V = 22/7 x 4900 x 100
V = 1.540.000 cm³

tabung kecil
V = πr²t
V = 22/7 x 17,5 x 17,5 x 50
V = 22 x 2,5 x 17,5 x 50
V = 48.125 cm³

banyak tabung = V tabung besar : V tabung kecil
                        = 1.540.000 : 48.125
                        = 32 buah

jawaban D