Question

20 porciento de x igual 80

Answer 1

Porcentajes, se calcula de esta manera

$\bold{b\%\ de \ a= \dfrac{b*a}{100}}$

$\bold{20\%\ de \ x= 80} \\\\ \bold{\dfrac{20}{100} * \ x= 80} \\\\ \bold{x= 80 \ :\ \dfrac{20}{100} } \\\\ \bold{x= \dfrac{8000}{20} } \\\\ \boxed{x=400 }$

Verificamos

$\bold{20\%\ de \ x= 80} \qquad\qquad x=400\\\\ \bold{\dfrac{20}{100} * \ 400= 80} \\\\ \bold{\dfrac{20*400}{100}= 80} \\\\\\ \bold{\dfrac{8000}{100}=80 }\\ \\\\ \bold{\dfrac{\not 8\not 0\not 0\not 0^(^8^0)}{\not 1\not 0\not 0^1}=80 } \\\\ \\\boxed{80=80\qquad \checkmark }$

Espero que te sirva, salu2!!!!