Let me ask you two questions about the transformation unit 1.

The analysis is as follows:

There are four kinds of books: science, technology, literature, comics, history and geography.

Comics are from the other three books 1/3.

So what is the number of comics in the total (if comics are regarded as 1, then the other three are three, and the total number is four)

1÷( 1+3)= 1/4

The number of history and geography accounts for 1/4 of the other three books (if history and geography are regarded as 1, then the other three books are 4 and the total is 5).

So what is the total number of historical geographic stations?

1÷( 1+4)= 1/5

So what is the total number of remaining science and technology books and literature bookstores? (Think of the total as 1)

1- 1/4- 1/5= 1 1/20

Science and technology books account for 3/4 of literature and art books.

So how many science and technology books (science and technology books and literature and art books)

3/(4+3)=3/7

So what is the number of science and technology books in the total?

1 1/20*3/7 =33/ 140

How many literary books account for the total! ?

1 1/20-33/ 140= 1 1/35

Historical geography 1/5, literature and art 1 1/35.

Literature and art books account for more than history and geography books in the total number. How much more?

1 1/35- 1/5=4/35

Why? Because there are 80 more books on literature and art than on history and geography. So the proportion of these 80-odd books in the total is 4/35?

Then the total number of books = 80/4/35 = 20 * 35 = 700.

The second question uses the same analysis method.

The weight of oranges is 6/25 of that of the other three fruits.

Oranges account for 6/(25+6)=6/3 1 of the total.

Bananas are 7/24 of the other three fruits.

Bananas account for 7/(24+7)=7/3 1 of the total.

How much do pears and apples account for in total?

1-6/3 1-7/3 1= 18/3 1

The weight of pear is 4/5 of that of apple.

How many pears (pears and apples)?

4/(5+4)=4/9

Apples account for (the number of pears and apples)