Verified answer

Resposta:

6)

"Joana"

18/25 . 4/4= 72/100= "72%"

Roberto:

"38/40": "19/20" . 5/5= "95/100"

= "95%"

"Roberto acertou mais."

______

7)

A)70/100 . X = "28"

"7x/10= 28"

"x/10 = "4 "

x= 40

_______

B)120/100 . X = " 180"

"12x/10 = 180"

"6x/5 =180""

"x/5= 30 "

"x=150"

_________

8)

1900.12%

"1900.12/100"

"19.12"

="2128"

= "228+1900"

= 2128"

"O novo valor R$ 2128,00"