Question

1) Em cada caso calcule a porcentagem:
a)10% de 350
b)8% de 50
c)15% de 70
d) 20% de 90
e) 40% de 150

Answer 1

Espero ter ajudado.

A

$\frac{1}{10}\cdot \:350\\\\\frac{1}{10}\cdot \frac{350}{1}\\\\\frac{35}{1}\\\\=35$

B

$\frac{2}{25}\cdot \:50\\\\\frac{2}{25}\cdot \frac{50}{1}\\\\\frac{2}{1}\cdot \frac{2}{1}\\\\\frac{4}{1}\\\\=4$

C

$\frac{3}{20}\cdot \:70\\\\\frac{3}{20}\cdot \frac{70}{1}\\\\\frac{3}{2}\cdot \frac{7}{1}\\\\\frac{3\cdot \:7}{2\cdot \:1}\\\\\frac{21}{2}=10.5$

D

$\frac{1}{5}\cdot \:90\\\\\frac{1}{5}\cdot \frac{90}{1}\\\\\frac{18}{1}\\\\=18$

E

$\frac{2}{5}\cdot \:150\\\\\frac{2}{5}\cdot \frac{150}{1}\\\\\frac{2}{1}\cdot \frac{30}{1}\\\\\frac{2\cdot \:30}{1\cdot \:1}\\\\\frac{60}{1}\\\\=60$

Answer 2

Resposta:

A)10 * 350 = 3500/100= 35

B) 8*50 = 400/100 = 4

C) 15 *70= 1050/100 = 10,50

D) 20*90= 1800/100 = 18

E) 40*150= 600/100 = 60

Explicação passo-a-passo:

350.....100%

  x........10%      

100x= 10*350

100x= 3500

x= 3500/100 = 35