Respuesta :

I hope this helps you
Ver imagen Аноним
faizu
3/4 k+3/8 k=12
=> 24/32 k + 12/32k = 12
=> 36/32 k = 12 
=> 36k = 12 *32 = 384
=> k =  384/36
=> k = 32/3 

Hope it helps !!!!