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The library has bought a new batch of books (1). The number of story books is 30 more than that of encyclopedias. How many story books are there? (2) Put the composition book in two places.
( 1)9×2+30,

= 18+30,

=48 (Ben).

There are 48 story books.

(2) 120÷2÷3,

=60÷3,

=20 (Ben).

Answer: On average, there are 20 books on each floor.

(3)2× 120+ 10×9,

=240+90,

=330 yuan.

330 > 300, so it is not enough.

A: Not enough.

(4) How many copies are there in three books?

So, the answer is: how many books are there in three kinds of books?

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