Then the required bookshelves are: 200000000 ÷ 500 = 400000 = 4×105 (pieces),
A: The collection of the National Library of China needs 4× 105 such bookshelves;
According to the survey, the number of students in our school is 2000.
It can be borrowed by students from schools like X,
From the meaning of the question, 2000× 10x=200000000,
Solution: x =10000 =1×104,
Answer: 1× 104 students can borrow it.