Question

continuação da atividade alguém pra ajustar​

Answer 1

Resposta:

Explicação passo-a-passo:

1)

a) 12 || 14 || 12/14 || 6/7

b) 18  || 21 || 18/21 || 6/7

c) 30 || 35 || 30/35 || 6/7

d) 600/7 || 100 || (600/7)/100 || 6/7

e) 100 || 350/3 || 100/(350/3) || 6/7

b)

12/x= 14/21 (:7)/(:7)

12/x= 2/3

12.3 = 2x

36 = 2x

2x= 36

x= 18

18/21 (:3)/(:3) = 6/7

_________

C)

12/30 = 14/y

6/30 = 7/y

1/5 = 7/y

y = 35

30/35 (:5)/(:5) = 6/7

___________

D)

30/35 (:5)/(:5) = z/100

6/7 = z/100

6.100 = 7z

600/7 = z

Z = 600/7

600/7 ÷ 100 = 600/7 . 1/100 = 600/700 = 6/7

________

E)

12/100 (:2)/(:2) = 14/w

6/50 = 14/w

6.w = 50.14 (:2)

3.w = 50.7

3w = 350

w = 350/3

100 ÷ (350/3)

100 . 3/350 = 300/350 = 30/35(:5)/(:5)= 6/7

_______________

2)

30 alunos => 12 meninas

x +12 = 30

x = 30 - 12

x = 18 meninos

a)

Meninas para total

12/30 (:6)/(:6) = 2/5

B)

Meninos para total

18/30 (:6)/(:6)= 3/5

C)

Meninas para meninos

12/18 (:6)/(:6)= 3/2