Question

how does blanket extinguish fire

Answer 1

it stops the supply of air due to which fire extinguishes

Answer 2

for a fire fuel Oxygen and heat are needed forming the fire triangle removal of any of these will result in the removal of the fire the blanket will cover the fire and prevent oxygen from get into it so that the fire cannot burn what little oxygen is trapped under the fire blanket will quickly turn to carbon dioxide as a fire burns out
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