Question

Qual o valor de y na proporção 12 : y = 21 : 175

a) 100       
                                     b) 50         
          c) 25

A

B

C​

Answer 1

$\frac{12}{y}=\frac{21}{175}\\\\12\cdot \:175=y\cdot \:21\\\\2100=y\cdot \:21\\\\y\cdot \:21=2100\\\\\frac{y\cdot \:21}{21}=\frac{2100}{21}\\\\y=100$

Letra A

Answer 2

Letra (A) 100 e a certa