Question

quanto vale x? 2/3=x/21. 6/x=42/70

Answer 1

a)2/3 = x/21
2*21 = 3x
42 = 3x
x=42 / 3
x = 14

b) 6/x = 42/70
6*70 = 42x
420 = 42x
x=420/42
x=10