Respuesta :

Answer:

642 mm or 64.2 cm

Step-by-step explanation:

67cm-28mm

We need the same units

67 cm * 10 = 670 mm

670 mm - 28 mm

642 mm

We can convert back to cm by dividing by 10

64.2 cm

Answer:

642mm or 64.2 cm

Step-by-step explanation:

67 cm = 670mm

So, that's 670-28mm = 642mm