Ans. to the ques. no- a

We have gained the knowledges about Garments washing, purposes, requirements, types of washing, effects of washing, types and function of chemical used in washing planet.

Ans. to the ques. no- b

It would be better if we can learn these things practically. 

Ans. to the ques. no- c

Yes, I have understood all the things that our respected sir had described before.