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        Q: Are paper clips plastic?
A: A paper clip ( or occasionally paperclip ) is a device which holds various sheets of paper together by way of pressure : it leaves the paper intact and is feasible to quickly and readily removed , in contrast to the staple . Source : s.com 

Q: A box of paper clips,?
A: What sizeth doth the boxe be ? 

Q: How many paper clips are in a box?
A: You were correct , you add 2/5 + 3/10 = 4/10 + 3/10 = 7/10   Since you 're not telling us nothing about the real numbers of paper clips , you are able not reply in number . So , together they picked up 7/10 of the paper clips . Originally , 10/10 were on the floor , Now 3/10 continues to be on the floor .