Question

calcule
A) 18% de 180

B)35% de 80

C)40% de 160

D)50% de 200

E)1,5 de 30



ajudinha​

Answer 1

a)

$\frac{18}{100} = \frac{x}{180}$

Faça meio pelos extremos

$100 \times x = 18 \times 180$

$100x = 3.240$

O 100 está multiplicando, então ele passa divindo

$x = \frac{3.240}{100}$

É a mesma coisa que 3.240 ÷ 100

$x = 32,4$

b)

$\frac{35}{100} = \frac{x}{80}$

$100 \times x = 35 \times 80$

$100x = 2.800$

$x = \frac{2.800}{100}$

$x = 28$

c)

$\frac{40}{100} = \frac{x}{160}$

$100 \times x = 40 \times 160$

$100x = 6.400$

$x = \frac{6.400}{100}$

$x = 64$

d)

$\frac{50}{100} = \frac{x}{200}$

$100 \times x = 50 \times 200$

$100x = 10.000$

$x = \frac{10.000}{100}$

$x = 100$

e)

$\frac{1.5}{100} = \frac{x}{30}$

$100 \times x = 1.5 \times 30$

$100x = 45$

$x = \frac{45}{100}$

$x = 0.45$