Question

3. Calcule as porcentagens abaixo.

a) 40% de 100=
b) 50% de 120 =
C) 30% de 60=
d) 20% de 70 =​

Answer 1

• a) 40% de 100 = 40

$100 - - - 100\% \\ x - - -40\% \\ 40 \times 100 = 100x \\ x = \frac{4000}{100} \\ x = 40$

• b) 50% de 120 = 60

$120 - - - 100\% \\ x - - - 50\% \\ 50 \times 120 = 100x \\ x = \frac{6000}{100} \\ x = 60$

• c) 30% de 60 = 18

$60 - - - 100\% \\ x - - - 30\% \\ 30 \times 60 = 100x \\ x = \frac{1800}{100} \\ x = 18$

• d) 20% de 70 = 14

$70 - - - 100\% \\ x - - - 20\% \\ 20 \times 70 = 100x \\ x = \frac{1400}{100} \\ x = 14$