Question

resolva as questoes abaixo

a ) 10 % de 900

b) 12 % de 540

c) 25 % de 1200

d) 35 % de 2800

Answer 1

Explicação passo-a-passo:

Basta usar regra de 3 em todos os casos:

a) 100% = 900

10% = x

100x = 900 x 10

100x = 9000

x = 9000/100

x = 90

10% de 900 é 90

b) 12% de 540

100% = 540

12% = x

100x = 12 x 540

100x = 6480

x = 6480/100

x =64.8

c)25% de 1200

100 = 1200

25 = x

100x = 1200 x 25

100x = 30000

x = 30000/100

x = 300

d) 35% de 2800

100 = 2800

35 = x

100x = 2800.35

100x = 98,000

x = 98,000/100

x = 980

Answer 2

a)

900(100%) e x(10%)

$\frac{900}{ \times } = \frac{100\%}{10\%}$

$9000= 100x$

$x= 90$

b)

540(100%) e x(12%)

$\frac{540}{x} = \frac{100}{12}$

$6480 = 100x$

x = 64,8

c)

$\frac{1200}{x} = \frac{100}{25}$

$100x = 30000$

$x = 300$

d)

$\frac{2800}{x} = \frac{100}{35}$

$100x = 98000$

$x = 980$

tenha bons estudos :P