Penjelasan dengan langkah-langkah:

2). V = s × s × s

V = 12 × 12 × 12

V = 144 × 12

V = 1.728 cm³

B). V = s × s × s

V = 15 × 15 × 15

V = 225 × 15

V = 3.375 cm³

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A). V = r × r × r

V = 6 × 6 × 6

V = 36 × 6

V = 216 cm³

B). V = r × r × r

V = 8 × 8 × 8

V = 64 × 8

V = 512 cm³

C). V = r × r × r

V = 10 × 10 × 10

V = 100 × 10

V = 1.000 cm³

D). V = r × r × r

V = 15 × 15 × 15

V = 225 × 15

V = 3.375 cm³

E). V = r × r × r

V = 20 × 20 × 20

V = 400 × 20

V = 8.000 cm³

F). V = r × r × r

V = 21 × 21 × 21

V = 441 × 21

V = 9.261 cm³

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cari volume kubus dulu

V = s × s × s

V = 7 × 7 × 7

V = 49 × 7

V = 343 cm³

abis itu kurangi

air yang perlu ditambahkan = 343 cm³ - 320 liter

air yang perlu ditambahkan = 23 liter