let me start by saying, this is one of the easiest things you will ever encounter in math and if you seriously dont know how to do this then you need to look it up and figure it out. i feel bad even giving you the answer because you should know how to do this and it took literally 30 seconds for me to get all the answers.
1- 16/20
2- 18/35
3- 12/9
4- 52/60
5- 25cm wide
6- 12cm long