Question

ME AJUDEM PF!! NESSAS 3 QUESTÕES 25 pontos!!!

Answer 1

20.

a) 72-45= 27

b) 45 -- 100%

27 -- x

45x=2700

x=2700÷45

x=60%

c)72 -- 100%

27 -- x

72x=2700

x=2700÷72

x=37,5

21.

a) 12 -- 100%

x -- 75%

100x=900

x=900÷100

x=9

b) R$12,00-R$9,00= 3 reais

c)12 -- 100%

3 -- x

12x=300

x=300÷12

x=25

22.

a) x -- 100%

1,20 -- 60%

60x=120

x=120÷60

x= 2 reais

b) 2 -- 100

x -- 64

100x=128

x=128÷100

x=1,28

_______

1,28 -- 64

1,20 -- x

1,28x=76,8

x=76,8÷1,28

x=60%