Question

determine 25% de 400

Answer 1

Use regra de três:

400__100%
  x  __25%              multiplique cruzado:

$100x=400*25\to 100x=10000\to x= \frac{10000}{100} \to x=100$


R.: 25% de 400 equivale a 100.

Answer 2

100

25/100 . 400 = 10000/100 = 100