Respuesta :

3/5 = 6/x

3/5 * x = 6/x * x

3/5 * x = 6

3/5 x = 6

5/3 * 3/5 x = 5/3 * 6

x = 30/3

x = 10
Well you will cross multiply 
You will get: 3x=30
Next: You will divide both sides by 3
You will get: x=10
^That would be your answer

HOPE THIS HELPS! ^_^