Question

Resolva as regras de 3:

a-) 180 - 100
X - 30

b-) 120 - 100
36 - X

c-) 24,9 - 100
X - 20

d-) 76 - 100
57 - X

e-) X - 100
1800 - 6

f-) 143 - 100
X - 10

g-) 16.000 - 100
18.000 - X

h-) 80 - 100
X - 25

* Todos têm 100 pois são referentes á porcentagem

Answer 1

OI...

a)

180 -----100

x----------30

100x = 180.30

100x = 5400

x = 5400/100

x = 54

b)

120-------100

36---------x

120x = 3600

x = 3600/120

x = 30

c)

24,9------100

x-----------20

100x = 498

x = 498/100

x = 4,98

d)

76------100

57------x

76x = 5700

x = 5700/76

x = 75

e)

x---------100

1800---6

6x = 180000

x = 180000/6

x = 30000

f) 143------100

x------------10

100x = 1430

x = 1430/100

x = 14,3

g)

16000 -----100

18000-----x

16000x = 1800000

x = 1800000/16000

x = 112,5

h)

80------100

x----------25

100x = 2000

x = 2000/100

x = 20

Espero ter ajudado