Question

20% de 200
10% de 800
35% de 300
17% de 100
5% de 60
30% de 90
75% de 40
70% de 800

Answer 1

OI..

Regra de três, multiplique cruzado.

a) 20% de 200

100%-----200

20%------x

100x = 20.200

100x = 4000

x = 4000/100

x = 40

b) 10% de 800

100%--------800

10%----------x

100x = 8000

x =8000/100

x = 80

c) 35% de 300

100%--------300

35%----------x

100x = 10500

x = 10500/100

x = 105

d) 17% de 100

100%--------100

17%-----------x

100x = 1700

x = 1700/100

x = 17

e) 5% de 60

100%--------60

5%-----------x

100x = 300

x = 300/100

x = 3

f) 30% de 90

100%------90

30%--------x

100x = 2700

x = 2700/100

x = 27

g) 75% de 40

100%-------40

75%--------x

100x = 3000

x = 3000/100

x = 30

h) 70% de 800

100%---------800

70%-----------x

100x = 56000

x = 56000/100

x = 560

Espero ter ajudado.