Oceans

The Earth's surface is approximately 510,000,000 km² and is 7/10 covered by oceans. Of which 1/2 covers the Pacific Ocean, the Atlantic Ocean 1/4, the Indian Ocean 1/5 and the Arctic Ocean 1/20. What parts of the Earth's surface cover each ocean?

Correct result:

T =  178500000 km²
A =  89250000 km²
I =  71400000 km²
L =  17850000 km²

Solution:

$T=510000000\cdot 7\mathrm{/}10\cdot 1\mathrm{/}2=178500000{\text{km}}^2=1.785000\cdot 10^8{\text{km}}^2$

$A=510000000\cdot 7\mathrm{/}10\cdot 1\mathrm{/}4=89250000{\text{km}}^2=8.925000\cdot 10^7{\text{km}}^2$

$I=510000000\cdot 7\mathrm{/}10\cdot 1\mathrm{/}5=71400000{\text{km}}^2=7.140000\cdot 10^7{\text{km}}^2$

$L=510000000\cdot 7\mathrm{/}10\cdot 1\mathrm{/}20=17850000{\text{km}}^2=1.785000\cdot 10^7{\text{km}}^2$

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