Question

Resolva a) x/5 = 8/10 b) 3/7 = 4/x

Answer 1

É só multiplicar cruzado:

a) x/5 = 8/10
10x= 40
x= 40/10
x=4

b) 3/7 = 4/x
3x=28
x = 9,3..

Answer 2

a)x/5 = 8/10; 10x = 5.8; 10x = 40; x= 40/10; x= 4; b) 3/7 = 4/x; 3x = 7.4; 3x = 28; x = 28/3