Question

Calcule quanto por cento corresponde:
A) 8 de 40
B) 12 de 50
C) 5 de 74
D) 16 de 20
E) 24 de 240
F) 125 de 558
G) 36 de 244
H) 182 de 420
Me ajudem por favor

Answer 1

Resposta:

Explicação passo-a-passo:

A) 8 de 40

8=> x

40 => 100

8/40 (:8)/(:8) = x/100

1/5 = x/100

100 = 5x (:5)

20= x

x = 20%

R.: 20%

___________

B) 12 de 50

12 = x

50 = 100

12/50 = x/100

12/1 = x/2

12.2 = x

x = 24%

R.: 24%

________

C) 5 de 74

5 => x

74 => 100

5/74 = x/100

5/37 = x/50

5.50 = 37.x

250= 37x

37x = 250

x = 250/37

x = 6,76%

R.: 6,76%

_____________

D) 16 de 20

16=> x

20 => 100

16/20 (:4)/(:4) = x/100

4/5 = x/100

4/1 = x/20

4.20=x

x = 80%

R.: 80%

___________

E) 24 de 240

240 = 100

24 = x

240/24 = 100/x

10 = 100/x

10x = 100

x = 10%

R.: 10%

____________

F) 125 de 558

558 = 100

125 = x

558/125 = 100/x

558.x = 125.100 (:2)

279.x = 125.50

279x = 6250

x = 6250/279

x = 22,4%

R : 22,4%

____________

G) 36 de 244

36 = x

244 = 100

36/244 (:4)/(:4) = x/100

9/61 = x/100

9.100 = 61x

900 = 61x

61x = 900

x = 900/61

x = 14,75%

R.: 14,75%

______________

H) 182 de 420

420 => 100

182 => x

420/182 = 100/x

42/182 = 10/x

21/182 = 5/x

21x = 182.5

21x = 910

x = 910/21

x = 43,33%

R.: 43,33%