Answer:
Equivalent fraction of ⅘:

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<span> The swimming pool had 2.5 million
liters of water in it</span>
After some was evaporated , the remaining was 2 million liters
2.5 millions...................100%
2 millions........................x
x = (2/2.5)*100% = 80 %
This means that (100-80)%------ > 20% (0.5 million liters) was
evaporated