Question

Encontre as frações equivalentes:

13) 5/11 = 35/x

16) 30/81 = x/27​

Answer 1

13)                  
          $\frac{5}{11} = \frac{35}{x} \\ 5x = 11 . 35 \\ 5x = 385 \\ x = \frac{385}{5} \\ x = 77$

16)
          $\frac{30}{81} = \frac{x}{27} \\ 81x = 30 . 27 \\ 81x = 810 \\ x = \frac{810}{81} \\ x = 10$