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70% - x
38000000 km³ × 70% ÷ 100% = 1862000000 km³
B)
38000000 + 1862000000 = 1900000000
100% - x
2% -1900000000 km³
100% × 1900000000 km³ ÷ 2% = 295000000000 km³
B.) 38 mln km³ → 2 %
x → 98%
x = 1862 mln km³
Objętość wszystkich wód: 1862 mln km³ + 38 mln km³
= 1900 mln km³