Question

qual é maior:
80 % de 20
   ou
20% de 80

Answer 1

80% de 20= 0,8*20=>16
20% de 80=0,2*80=>16
São iguais 

Answer 2

$80\%~de~20=\dfrac{80}{100}*20\\\\\\80\%~de~20=8*2\\\\\\\boxed{\boxed{80\%~de~20=16}}$
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$20\%~de~80=\dfrac{20}{100}*80\\\\\\20\%~de~80=2*8\\\\\\\boxed{\boxed{20\%~de~80=16}}$
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Como pode ver, são iguais