Resposta :

4/5 = 80% 
1/4 = 25% 
2/10 = 20% 
3/25 = 12%
21/300 = 7%
33/150 = 22%

4/5=20  1/4=25  2/10=10   3/25=4   21/300=0,333...   33/150=0,666...

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