Question

PF me ajudem exercícios com foto

Answer 1

9)  42/30 = x/10
30 x = 42 . 10
30 x = 420
x = 420/30
x = 14

42/30 = y/20
30 y = 42 . 20
30 y = 840
y = 840/30
y = 28

 8)       80/60 = 90/x
           80 x = 60 . 90
            x = 5400/80
            x = 67,5 m