A long bandage for head is required

Concept: 

Bandage: 

• A bandage is a piece of fabric that can be used by itself to support or restrict motion in a body part or to support a medical device like a dressing or splint.
• After the dressing has been applied directly to the wound, it is used in conjunction with a bandage to maintain it in place.
• The three most popular types of bandages are triangular bandages, roller bandages, and tailed bandages.

Explanation:

Two bandage:

• It is basically 2 piece of cloth that is used for dressing in the head injury, shoulder injury etc.

One bandage:

• It is basically 1 piece of bandages that are used for dressing the area are hand injury, thumb injury etc.

Three bandage:

• It is basically  3 piece bandages that is used for dressing the wound area are ankle injury, elbow injury, and knee injury.

Four bandage:

• There are 4 pieces of bandages that are used in chest injury, thighs injury and to cover the large area of the wound.

Thus, a long bandage for the head requires 2 bandages.